I have been having a problem with slow internet speeds for a couple weeks now. I've been on the phone on and off with Comcast for hours and had two technicians come out and tell me there's no problem on my end.
I'm on Perfomance internet and should be able to get 6-12Mbps down and 1-2Mbps up. Speed tests give me outrageous results saying I'm doing about 20+ down at 3-5 up. In reality, when I download my speeds start at around 3-4 Mbps and after about 30 seconds slow down until, around the 1 minute mark, it settles at around 1 Mbps. It will drop to 800kbps and go up to around 1.05Mbps. That's where it will stay throughout the download. It doesn't matter what browser I use or if I use a download manager or not. For uploads, speeds start at around 2 - 3 Mbps and slowly fall to settle right around 250 kbps.
When I first joined Comcast about a month ago, I believe my speeds were fine. I didn't test them, I just knew they were a lot faster than they were. I didn't know about the 250 GB limit at the time (though it's been suspended) and I did about a week of heavy uploading to help a friend (I don't think I hit that limit and the data usage meter on the Comcast site has me at 23 GB (though I know I've done more than that). Then my speeds crashed. I know others have experienced this issue and they're always asked for this information about their modem so here it is (Oh, I'm hardwired and don't use a router)
Channel ID 30
Frequency 555000000 Hz
Signal to Noise 38 DB
Downstream Modulation QAM256
Power Level 6 dBmV
Channel ID 6
Frequency 30400000 Hz
Ranging Service ID 8241
Symbol Rate 2.560 Msym/sec
Power Level 41 dBmV
Upstream Modulation  QPSK  16QAM
Ranging Status: Success
I noticed the technician (the 1st one pulled up this but didn't say anything about it. I didn't know what it was.
Aug 25 2012 08:13:58 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0;
Aug 25 2012 08:13:51 6-Notice I401.0 TLV-11 - unrecognized OID;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 25 2012 08:13:51 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:13 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 25 2012 08:13:12 6-Notice I401.0 TLV-11 - unrecognized OID;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0;
Aug 25 2012 08:13:12 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:03 5-Warning D04.1 ToD request sent - No Response received;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:05:46 3-Critical T05.0 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:13 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0; Aug 25 2012 08:07:00 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 25 2012 08:06:55 5-Warning T202.0 Lost MDD Timeout;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 25 2012 08:06:33 3-Critical T05.0 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 24 2012 23:51:37 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 24 2012 22:51:34 4-Error C201.0 DCC rejected already there;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 24 2012 22:51:33 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 24 2012 22:51:33 4-Error C201.0 DCC rejected already there;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 24 2012 21:42:24 6-Notice I401.0 TLV-11 - unrecognized OID;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 24 2012 21:42:24 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 24 2012 21:42:06 3-Critical C206.0 DCC aborted unable to communicate on new upstream channel;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0; Aug 24 2012 21:42:06 3-Critical R08.0 16 consecutive T3 timeouts while trying to range on upstream channel 6;CM-MAC=94:cc:b9:18:b4:6e;CMTS-MAC=00:30:b8:cb:fd:30;CM-QOS=1.1;CM-VER=3.0;
The second technician checked all the signal levels to and from the modem and did ping tests and other stuff. I'm really frustrated at this point. I had close to these speeds on DSL and didn't have a limit or hassles and it was cheaper.
I've noticed speed decreases also. My router logs during this same time show a fairly significant increase in Distributed Denial of Service attacks (DDoS) that might be going on site wide with Comcast. I wish I could offer a fix, but I think this is Comcast's problem.
According to Microsoft, Vista SP2 completely removes the limit of 2-25 half-open TCP connections that existed in previous versions for application compatability reasons.
We're not aware of any documentation introducing new registry keys to change the TCP half-open connection limit. If this works as intended, there should be no need to patch tcpip.sys, and users should no longer see Event ID 4226.
And the issue I'm experiencing is new. I'm not sure what my speeds were a couple weeks ago but they were much faster. Now my speeds start good (download 4-6 Mbps) (upload 2-3 Mbps) but are quickly throttled back to 1 Mbps for a download and 300 kbps for an upload. This happens within a minute.
And I should have mentioned that I use the Motorola Sufboard eXtreme Cable Modem SB6121 DOCSIS 3.0 and it's new.
Something is certainly throttling my speeds since they're so steady. After the first minute downloads remain between 1-1.5 Mbps and uploads remain between 250-350 kbps. I initially thought Comcast was throttling my speeds due to the heavy uploading I was doing. If this is the case, I do understand the reasons behind it and I just want someone to work with me to restore my speeds and let me know how to prevent this in the future. It isn't the "congestion control" I've been reading about because it doesn't matter what time of day I attempt to upload/download. I can't get anyone to tell me that's what's happening but at the same time, I've spoken with 4 different people at Comcast and had 2 technicians out and no one can find a problem. I'm still hoping to find some help here.
I have an idea, I don't know how tech savvy you are but I want to walk you through something. Go to Control Panel, Device Manager, Network adapters, and right click on the adapter you use to connect. Make sure you have no software adapters or anything weird that may be limiting your connection. After you right click on the network adapter itself, go to properties. Let me know what settings you have set up, link speed, negotiation etc are very important to your connection speed overall.. and please tell me your adapter type..
Thanks so much for all your help guys. I'll try the things you suggested but first let me post this in case this changes everything in your minds. I talked to a really cute tech guy I bumped into today (he's not with Comcast) and he told me to try this:
He told me to do 3 consecutive speed tests, then start an upload or download and wait for the speeds to crash and then do 3 more consecutive speed tests and see if the results were drastically different which might tell me if it's my computer itself limiting my speeds or a problem with the modem or Comcast. He said that since I should be able to pull speeds of 6-12 in a download then having a download going at around 1 Mbps shouldn't affect the speed tests much.
Here's the results of the first 3 speed tests before I started a download:
Test 1: Ping 5 - Download 15.16 - Upload 2.79
Test 2: Ping 5 - Download 14.01 - Upload 2.82
Test 3: Ping 5 - Download 15.02 - Upload 2.88
So pretty consistent and I guess that means my computer is capable of high speeds? Anyway, I started a download and my speed started off at 4 Mbps and after about 30 seconds began slowing down until it hit my usual 1 Mpbs - 1.5 Mbps. I left the download going and did three more speed tests. Here's those results:
Test 1: Ping 435 ms - Download 1.19 - Upload .32
Test 2: Ping 406 ms - Download 1.03 - Upload .44
Test 3: Ping 412 ms - Download 1.56 - Upload .52
Does that change anyone's ideas on anything? I did read in another thread that there is some compatibility issues going on with the Motorola SB6121 but my symptoms are slightly different than those being posted in that thread. They are complaining of slow speeds but their's are really erratic (and not as slow as mine) and mine are steady. They are experiencing alot of disconnections ranging from 5 to 10 minutes apiece and I'm not experiencing that. So I don't think that's the issue.
I am almost positive is is a connection limitation somewhere. I have been wrong before though! haha Let me know your network adapter setup info, because pre and post download speeds should not do that.. I know there is a registry tuning fix too I am trying to find for you. I will let you know when I come across it.
So pretty consistent and I guess that means my computer is capable of high speeds? Anyway, I started a download and my speed started off at 4 Mbps and after about 30 seconds began slowing down until it hit my usual 1 Mpbs - 1.5 Mbps. I left the download going and did three more speed tests. Here's those results:
Before you go on to more complex problem solving, are you sure you are not confusing megaBYTES with megaBITS? That's probably not it, but I thought I'd ask just in case.
Wow, thanks for all the suggestions, guys. I'm trying to keep up with you. I'm about to do the test suggested and will post the results when I have them. First things first. Here's what I tried today.
I purchased a new modem since it was suggested by someone else that maybe my modem was heating up and causing my speeds to drop after a minute. The new modem made no difference. Same issue.
I talked to Comcast again and asked if my speeds were being throttled (and I was very nice again - just wanted to know what I needed to do to get my speeds back and how to prevent it in the future. They connected me with Comcast Security and they said they don't throttle speeds and the 250 GB limit was suspended. They said everything looked good on their end and their have been no security issues taken against my account. I didn't hit that 250 GB limit last month and am nowhere close to it this month (if it was stil in exisitence, which it isn't.) He was reading my signals good and everything looked fine though, when I explained (again) what was happening, he said it did sound like my speeds were being limited by something. Anway, I'm pretty certain now that Comcast isn't doing anything to keep my speeds down.
I ran a full system virus scan (took nearly all night since I scanned all my external hd's as well) nothing showed up. I'm going to run the Microsoft Malicious Software Removal Tool tonight since it will take a long time to go through all my external hd's.
Someone else suggested, since the results of my speedtest crashed after starting a download even though that download was only pulling 1 Mbps, to try running a YouTube video and run the speed test at the same time. My speed test showed good: ping 5 - download 15.12 - upload 2.8
Now to answer some questions.
Yes, my drivers are all updated.
I use speedtest.net as well.
Of all the complicated things you've asked me, the one that threw me the most was the simplest - was I talking about Megabytes or Megabits. I think I'm talking about Megabytes, aren't I? The speeds listed by speedtest.net were Mbps. I use a download manager which lists the speeds as MB/s and I'm sure it's talking Megabytes since when it starts to drop below 1 MB/s, it goes into kbps (like 980 kbps) and them into MB's again. Another program I use says MiB/s and keeps it around 1 MiB/s.
As to the suggestion of lifting the limit on the # of files I can download, that's not an issue at all. If I'm downloading 1 file my speeds hover around 1Mbps. If I'm downloading multiple files, the speeds slow so that all together I'm pulling around 1 Mbps. It also doesn't matter if I download directly from the net using a browser (like from We Transfer or Uploading.com) or use a download manager like JDownloader or use an ftp program. I always stay at 1 Mbps. I hope this is making sense, it's hard to type out.
Okay, My Network Adapter is Realtek RTL8168C(P)/8111C(P) Family PCI-E GBE NIC
It says the device is working properly and there are no conflicts. As to the other information you wanted, I'm not sure what that stuff is. This is all I see:
I/O Range E800 - E8FF (It also lists a memory Range, if you want it let me know but it's going to be weird trying to count all those 0's)
In the Advanced tap it says
Auto Disable Gigabit (Powersaving) - Disabled
Auto Disable PCIe (Powersaving) - Disabled
Auto Disable PHY (PowerSaving) - Disabled
Flow Control - Enabled
Green Ethernet - Disabled
Interrupt Moderation - Enabled
IPv4 Checksum Offload - Rx & Tx Enabled
Jumbo Frame - Disabled
Large Send Offload (IPv4) - Enabled
Large Send Offload v2 (IPv4) - Disabled
Large Send Offload v2 (IPv6) - Enabled
Network Address - Not Present
Priority & VLAN - Enabled
Receive Buffers - 512
Receive Side Scaling - Enabled
Shutdown Wake-On-Lan - Enabled
Speed & Duplex - Auto Negotiation
TCP Checksum Offload (IPv4) - Rx & Tx Enabled
TCP Checksum Offload (IPv6) - Rx & Tx Enabled
Transmit Buffers - 128
UDP Checksum Offload (IPv4) - RX & Tx Enabled
UDP Checksum Offload (IPv6) - Rx & Tx Enabled
Wake-On-LAN Capabilities - Pattern Match & Magic Pack
WOL & Shutdown Link Speed - 10 Mbps First
I hope what you were looking for is somewhere in that list. It's hard to type in greek If I missed something, just walk me through the steps to find it.
I'm about to do that other test Claude suggested. I'll post the results in a minute.
Thanks for your input stevnim. Yes, I read about the Congestion Technique as soon as I noticed this issue. It would most likely affect me since I am a heavy user. But I understand my speeds my decrease at certain times of the day but that would account for a variation in my speed. This issue with the 1 Mbps download limit and 350 kbps upload limit has been ongoing for 2 weeks or more and my speeds don't fluctuate regardless of the time of day... they're constant and consistent.
Here's the results to that Argonne National Laboratory Web100 based Network Diagnostic Tool (NDT) test:
It won't let me copy the results of the test and though it says it will email the results to the person I specify, I can't get it to do that either so... I have to type all this mumbo jumbo out!
Hope I don't make any mistakes!
TCP/Web100 Network Diagnostic Tool v3.6.4
Click START to start the test
** Starting test 1 of 1 **
Connecting to 'ndt.anl.gov' [ndt.anl.gov/220.127.116.11] to run test
Connected to: ndt.anl.gov-- Using IPv4 address
Another client is currently being served, your test will begin within 45 seconds
Checking for Middleboxes ..................Done
Checking for firewalls ..................Done
running 10s outbound test (client-to-server [C2S] ..... 2.93 Mb/s
running 10s inbound test (server-to-client [S2C] ..... 15.71 Mb/s
The slowest link in the end-to-end path is a 10 Mbps Ethernet subnet
Click Start to re-test
This next part is under Detailed Statistics:
WEB100 Enabled Statistics:
Checking for Middleboxes .................. Done
Checking for firewalls .................... Done
running 10s outbound test (client-to-server) [C2SI] ..... 2.93 Mb/s
running 10s inbound test (server-to-client [S2CI] ..... 15.71 Mb/s
-----Client System Details-----
OS data: Name = Windows Vista, Architecture = x86, Version = 6.0
Java data: Vendor = Sun Microsystems Inc., Version = 1.6.0_01
-----Web 100 Detailed Analysis-----
10 Mbps Ethernet link found.
Link set to Full Duplex mode
No network congestion discovered
Good network cable(s) found
Normal duplex operation found.
Web 100 reports the Round trip time = 113.96 ms; the Packet size = 1460 Bytes; and
No packet loss was observed
S2C throughout test: Packet queuing detected: 2.01%
This connection is receiver limited 93.89% of the time.
This connection is network limited 5.33% of the time.
Web 100 reports TCP negotiated the optional Performance Settings to:
Server 'ndt.anl.gov' is probably behind a firewall. [Connection to the ephemeral port failed]
Client is not behind a firewall. [Connection to the ephemeral port was successful]
Packet size is preserved End-to-End
Server IP addresses are preserved End-to-End
Information: Network Address Translation (NAT) box is modifying the Client's IP address
Server says [c-24-125-227-225.hsd1.va.comcast.net], but Client says [18.104.22.168]
This part is under the Web100 Variables (I really wish that copy feature worked!)
WEB100 Kernel Variables:
The theoretical network limit is 97.74 Mbps
The NDT server has a 329.0 KByte buffer which limits the throughput to 45.21 Mbps
Your PC/Workstation has a 255.0 KByte buffer which limits the throughput to 17.49 Mbps
The network based flow control limits the throughput to 17.59 Mbps
Client Data reports link is 'Ethernet', Client Acks report link is 'Ethernet'
Server Data reports link is 'Ethernet', Server Acks report link is 'Ethernet'
Okay, I'll leave the deciphering to you guys! I don't understand any of that. The only part that jumped out at me was : "This connection is receiver limited 93.89% of the time." I don't know what it means but it didn't sound too good. I'll be sitting here waiting for you genius' to figure this out for me!
Yes I saw that,and I also noticed your buffers are limiting your throughput to 17.49Mbps, which may be ok but I am gonna do some quick research for you..I know I am beating a dead horse now(I hope you've heard that expression) haha But when you download from P2P networks you are not connecting to one "server" or connection, it connects to multiple sources to download the fastest possible way, and there is also a setting in P2P softwares (usually) that allows you to set buffers etc. Not saying that is the problem, more of just explaining how they work, I think the setting is in your network card settings but I will let you know..
OK, I found something along the lines of what your diags are showing, try going into your NIC properties, select configure and click on the link speed tab and change the Speed & Duplex setting from Auto Negotation to 100Mbps full duplex. Disable and enable your nic and then try again, let me know what happens.. After this test we can try other things, I may have more by the time you try it..
OK 2 more things for you to try, should keep you busy for a while at least, This is the download page from realtek for your network card. There is usually a realtek version and a windows approved version. Try to uninstall the driver for the NIC by right clicking on it and selecting uninstall. Then try to load the realtek driver for Vista X86 and test it again. There is also a diagnostics program you can try if all else fails. Let me know how it goes for you! This kinda has me intrigued now, as I am seeing a lot of people with your card and similar problems, some fixed by a driver, (even an older one) some fixed by buffers, some by Full negotiation instead of auto, and even some with the connections setting.. hmmm I wish i could be of more help! Good Luck, don't forget to post if any of these fixes work! Thanks! http://www.realtek.com/Downloads/downloadsView.aspx?Langid=1&PNid=13&PFid=5&Level=5&Conn=4&DownTypeI...
My speeds are about the same after changing the setting on my NIC, disabling and enabling. There might be a little more variation. It did jump up to 2 Mbps a couple times for a brief second but all in all stayed between 900 kbps and 1.05 Mbps (once it slowed to that speed - I mentioned before that it starts faster for about 30 seconds). Uploading too perhaps varied a little more. It was going at the usual 250 - 300 kbps with the occasional very brief jump to 400 kbps.
Ok, that is actually a 1Gig NIC so we could try higher but that wasn't quite the jump I was hoping for...do you see a setting for send and recieve buffers? Can you tell me what they are set to? If the driver doesn't fix it that is..
Well, we're getting into things I know very little about now. I'm self-taught but am pretty good at researching things so that when I do run into a problem, I can usually find out how to fix it. Actually this is the first time something has baffled me. I don't mind trying to uninstall the NIC and reinstalling but I'm going to get some sleep first and consider if I want someone else to do it for me. I do have what may seem like a stupid question but the guidlines say stupid questions are okay! If I uninstall the NIC driver, isn't that going to disconnect me from the internet? How can I then get online to download the one from the website you gave me?
FWIW here, other than the "spinning wheel goes round and round', the original Shaperprobe results show that the Performance tier sustained speeds may be only 8/2 in your area. Have you called in to have them confirm or deny this ?
Hi, EG. By 8/2, do you mean 8 Mbps down and 2 up? I haven't asked about what I might expect as sustained speeds because I thought they'd tell me there are too many variables. But I'd be very happy with 8 down and 2 up, that's within the range of what I signed up for which was 1-2 up and 6-12 down. But I'm only getting 300 kbps up and 1 Mbps down in sustained speeds.
Edit: Oh, I see where you got those numbers now. Yes, I'd be content with those speeds. I'd be satisfied to at least hit the bottom tier of the plan I signed up for, 1 up and 6 down though I'd like to go as fast as I can. Oh, and you did answer a question I'd been longing to ask which is, what is a realistic expectation regarding sustained speeds. 8 and 2 is higher than I thought! I've been told that fiber optic should be available in my neighborhood within a year.
Perhaps you are having intermittent problems, but in that single snapshot in time that is what Shaperprobe showed. The lack of "shaping" on the upstream can a really be an indication that there was /is no *Powerboost* feature for the upload available at that time (or it's possibly totally disabled) on your local system. What does the tool average over longer periods of time ? Perhaps this is a Comcast system intermittent local capacity / congestion issue which has nothing to do with any of your equipment ? Cable segments are a *shared medium* after all.
Okay, after reading your comments, I see how to read this Shaper Tool now. This is fascinating! If I'm reading this right, this is telling me what I wanted to know which is: Is Comcast keeping my speeds this low. Tell me if I've got this right. I just did 5 consecutive tests and after the third one I tried an upload and a download (not at the same time obviously) and then did the final 2 Shaper tests. So this Shaper Tool is telling me that Comcast is limiting me to about 8 Mbps down and 2 up, right? That's the Shapen Rate 2097 kbps and 8437 kbps. I'd love to have those speeds. Now, the upload I started after the third test started at 400 kbps and after about 30 seconds settled in at between 250-300 kbps where it always stays regardless of the time of day. The download I tried after the third test started at nearly 5 MB/s and after 30 seconds settled between 900 kbps and 1.05 Mbps which is where it always settles. That proves that it's something on my computer limiting my speeds right? Otherwise, I could get the 8/2 the test shows Comcast is keeping me at. Am I reading this right? Here's the results of the 5 tests:
DiffProbe release. January 2012. Build 1008. Shaper Detection Module.
Oh, I didn't finish answering your questions, EG! Sorry, I had just woke up and hadn't had my coffee yet According to the 5 consecutive tests I did this morning, there is shaping on my upload. (Don't ask me what happened during that first test stating loss of packets. That's very unusual. I've been doing sustained ping tests on and off for a couple weeks with no packet loss). Maybe that first test I did a couple days ago saying there was no shaping on my upload was a fluke? And if it was Comcast doing intermittent congestion control (I've no problem with that) my speeds would be more erratic. I should be able to hit that 8/2 most of the time or at least some of the time. (Or at least that's whay my common sense tells me, you know far more about this than I do. If I'm wrong, just tell me, I can take it) My speeds are eerily steady all the time. I have absolutely no idea about this Powerboost or if it's disabled on my computer. Maybe the results of those 5 tests will tell you more and if you need me to check something on my computer, just walk me through it. I'll try anything once (usually twice before I determine if I actually like it or not).
The Powerboost temporary / short lived speed bursting effect at the beginning of an upload and / or download is not on "your computer" it is on their system and it is dynamic. That means it can come and go depending on the overall utilization of the bandwidth that happens to be available at any given time on your shared segment. The more local congestion that there is, the less Powerboost will be available to you and your neighbors. It can even be completlely gone.
The "shaping rate" is the sustained speeds after the initial Powerboost speed burst wears of. The "estimated capacity" is the amount of Powerboost before it has worn off.
It looks like you mostly have 8 down / 2 up sustained speed with Powerboost bursts to around 24-25 down / 3-4 up.
Thanks EG, that makes sense. I was wondering why my speed tests were so high, even above what I'm subscribed to. That would be because of the PowerBoost you're describing. I did do one speedtest a few days ago that said my download was 24+. And that explains why my uploads and downloads start faster - uploads around 3 Mbps and downloads around 4 Mbps. So they've got a limit on my sustained speeds at 8 down, 2 up (of course my actual sustained speeds will vary for numerous factors). All that makes sense to me now. Thank you. Now I still have to figure out why I can't even approach those speeds regardless of the time of day. My speeds are constant 24 hours a day except for that initial 30 second boost when I first start the ul or dl.
The suggestion to uninstall my network driver and then reinstall it from a link at the website has me worried because without my network driver I can't get online to download it again. If I'm wrong about that, let me know because I can't do anything until I know for certain.
Never mind the question about installing the network driver. I clicked on the download link to see what it would do and I see that I can save the file to my computer. I still have to look into this further before doing it though. I don't know what's involved.
Okay, I uninstalled the network driver and reinstalled using the link you provided. No change. I tried running the diagnostic tool but when I began to run it I lost my internet connection and couldn't get it back. It wouldn't come back til I uninstalled the diagnostic.
Receive Buffers are set at 512
I don't see any Send Buffers. I see a Transmit Buffers which is set at 128.
Oh, and the Malicious Software Removal Tool found no threats.
Sorry no contact today, was a busy one.. So you tried the driver to no avail, hmmm. I was hoping it would be something along those lines. Did you install anything 2-3 weeks ago? New firewall, virus scan anything at all no matter how small it seems? Your buffers seem to be set right, mine are 512 and 256 but I was hoping you had a smaller number in one of them than you do. I don't beleive the original speeds are power boost speeds either. I get around my promised speeds at all times if not higher then promised. Especially if its a noticable difference 2-3 weeks ago. Let me think on this a little.Are you using Norton from comcast or another AntiVirus program?
I can't think of anything I installed around the time of this happening. I've used Norton for years. The thing is, when I first joined Comcast a little over a month ago, I did a speed test and got great speeds so I didn't actually pay attention to the speed of my actual downloads and uploads. All I knew was that they were faster than I was getting so I was happy. Then a friend who was downloading some files from me (which depended on my upload speeds as it was ftp) mentioned that my speeds had tanked. He can't remember what they were before but he says they were faster. I can't guarantee I've been getting the speeds I'm supposed to at all. I wish I had paid more attention. That would have told me if something happened recently or if my computer has never pulled the correct speeds. I trust the person who mentioned this to me though.
I know its frustrating, its a slow process but don't worry we will get it! haha I have been fixing slow pcs for 15 years and we will get to the bottom of it, just trial and error. This is driving me nuts not sitting there at the pc or logged in remotely checking these things myself so I understand... When I used norton, I remember their being all kinds of network settings. Did you look at those? Try to disable your firewall very temporarily and try to test. If that does or doesn't work, turn it right back on. Norton may have updated its engine or something and it doesn't like a setting. I know it sounds like I am digging but bear with me ok? Did you get the task manager results yet?
I've already tried disabling my firewall and there was no change. I don't know about network settings on Norton, I'll look into it. And I missed your post about the Task Manager readings. You must have posted it while I was typing out my rant. Here are the results:
CPU runs between 15-33% with 22% being the average
Oops, I left a download going after testing the speeds the last time so the above results from task manager was with a download going at about 1Mbps. Here's the results with just the this page open on IE:
You memory usage is high but everything else looks good. Go into control panel, system, advanced and see what your virtual memory settings are. It should be default at system managed but make sure its turned on, post the result here. One other thing you can try now is, Start, Run, and type msconfig and enter. Select diagnostic startup, select apply, then ok and reboot. Once it comes back up test again, that will rule out any services or programs that may be blocking your speed..
Well, I don't think too many people would be happy with 250 kbps up and 1 Mbps down when they're paying for 1-2 up and 6-12 down. I guess I'll try to find help elsewhere. It certainly isn't going to be Comcast and apparently it won't be here, though I thought this forum was here to help people.
To answer hrtechnical's questions, since he's been kind enough to hang with me through this. I'm not sure if I got the information you wanted about my virtual memory As the pathway is different in Vista. I went to Control Panel - System and Maintenance - System - Advanced System Settings. Then in the Advanced Tap I went into the settings for Performance which stated Visual effects, processor scheduling, memory usage and virtual memory. Then went into settings. There were four options: Let WIndows choose what's best for my computer (this is the one that's checked), then the other options are Adjust for best apearance, Adust for best performance and Custom. Out of curiosity, I changed it to Adjust for best performance but my speeds didn't change so I changed it back.
I had to go into Safe Mode with Networking if I wanted to try an ul/dl. No change in my speeds.
I ran the test at http://ndt.anl.gov:7123/ again. I didn't compare all the #'s because they're meaningless to me. I just wanted to see if I was still around 98% receive limited after disabling that tcp thing I told you about (I didn't know if that had anything to do with it or not). I'm 95%+ limited. I don't know if that's my problem or what's causing it though.
The only other results I understand are:
running 10s outbound test (client to server) [C2SI]..... 2.60 Mb/s
running 10s inbound test (server-to-client) (S2CI] .... 11.70
I just cannot understand while all tests are telling me my speeds are this high when I can't pull anything more than 250-350 up and 900-1.5 down.
I am sorry you feel so let down, his is the first time using this forum for me, though I fix pcs professionally. Sorry I haven't been able to fix your problem yet but we will.. Do you want to contact me directly for more info? I will give you my email or something, I am not done everything yet and can help you... Try a program called ccleaner.exe to clean up temp files etc as I know you have a lot from file sharing. I have a few other ideas for you too. Don't give up yet!
She is using www.speedtest.net or whatever it is. She lost her speeds 2 weeks ago. Something changed for her speeds to drop so dramatically..
PS Nikki, I am actually on a vista system right now, you were very close to virtual memory but you adjusted visual settings. Go to Control Panel, System, Advanced tab. and under performance click settings, Then go to the advanced tab(right next to visual settings) and select change under virtual memory, That is what I am looking for..
I understand that, but she knows that something changed in her speeds, shes downloads a lot, its not limited or "shaped" so something is slowing her down. She can see a major differnce when filesharing from before 2 weeks ago. She knows her computer and how it should perform and it changed. Thats what matters.