GitHub Maxes Out at 1Mb/sec on 1G Connection

GitHub maxes out at 1Mb/sec and goes as slow as 300Kb/sec. This really hurts

me and my company with the large software development projects I work on.

Has anyone else noticed this?

I got a new modem from Comcast when having other problems with bandwidth,

and now I'm getting 600Mb/sec on the Comcast test (and 900Mb/sec wired),

which means the connection itself is at least 75% okay. But Speakeasy speed test

to destinations except Seattle (where I get 400Mb/sec) doesn't go above 50Mb/sec.

This definitely isn't GitHub itself. My coworker in Santa Clara gets much

faster checkouts (at exactly the same time) than I'm getting.... Git takes 17sec

for this clone command on my coworker's computer:

time git clone https://github.com/Telenav/kivakit.git

My computer gets 1:34 sec. About 6x slower. This is 100% repeatable. HTTPS versus

SSH doesn't make ANY difference.

Also it is definitely the provider. I worked with this same repository in Flagstaff using

Suddenlink and never had any problem. It also verifies that it's not the protocol.

Using my company's VPN just decreases the speed further:

Santa Clara checkout from internal repo: 28 seconds

Albuquerque checkout of same repo over VPN: 11 minutes 23 seconds

The only idea I can come up with is that Comcast is throttling connections. It doesn't

make a whole lot of sense to throttle Github though. Word would get around about

that pretty fast, and there are much bigger bandwidth hogs than git.

So, what is it?

Responses

XfinityLinda

Official Employee

•

1.8K Messages

3 years ago

Hello, @jonnny333! Thank you for connecting with us in our community! We are sad to hear you are having issues with your internet. We are happy to take a look at your concerns to see what may be affecting your speeds. If we may, please send over a Direct Message with your name and complete service address.

To start a Direct Message: Click "Sign in" if necessary

• Click the "Direct Message" icon (upper right corner of this page)

• Click the "New message" (pencil and paper) icon

• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list

• Type your message in the text area near the bottom of the window

• Press Enter to send your message.

jonnny333

Visitor

•

2 Messages

3 years ago

Hi @XfinityLinda

I already went through support up to the advanced network team.

I do have some more information (see below).

It looks like there could be significant packet loss on the route between me and GitHub.

The packet loss is occurring on Comcast internal backbone links, as I suggested.

There could be other reasons for this statistic showing up, but it's worth following up on.

Since the advanced network team refused to look into the problem ("third party"), maybe you could find a way?

Best,

Jon

                                                                                                                                           My traceroute  [v0.95]
Jonathans-iMac.local (10.0.0.180) -> github.com (140.82.114.3)                                                                                                                                                                                                                     2022-06-08T17:25:05-0600
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
                                                                                                                                                                                                                                                                   Packets               Pings
 Host                                                                                                                                                                                                                                                            Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. 10.0.0.1                                                                                                                                                                                                                                                      0.0%   297    3.6  26.9   2.4 204.6  42.4
 2. 100.92.205.131                                                                                                                                                                                                                                                0.0%   297   11.3  36.1   8.9 167.0  42.1
 3. 96.216.21.221                                                                                                                                                                                                                                                 0.0%   297   12.7  36.1  10.4 166.9  43.2
 4. 68.86.182.121                                                                                                                                                                                                                                                 0.0%   297   12.7  36.5   9.7 168.3  44.4
 5. be16-ar01.albuquerque.nm.albuq.comcast.net                                                                                                                                                                                                                    0.0%   297   11.6  35.6   9.9 166.3  42.8
 6. 96.108.43.101                                                                                                                                                                                                                                                 0.0%   297   12.1  36.4   7.4 299.2  44.4
 7. be-36831-cs03.1601milehigh.co.ibone.comcast.net                                                                                                                                                                                                               0.0%   297  167.9  54.3  18.1 274.3  54.8
 8. be-1314-cr14.1601milehigh.co.ibone.comcast.net                                                                                                                                                                                                               31.8%   297  128.5  54.1  18.7 239.9  52.9
 9. be-304-cr14.champa.co.ibone.comcast.net                                                                                                                                                                                                                       0.0%   296   80.7  49.7  18.7 231.4  48.2
10. be-1314-cs03.champa.co.ibone.comcast.net                                                                                                                                                                                                                      0.0%   296   34.4  57.5  16.5 294.9  59.3
11. be-3311-pe11.910fifteenth.co.ibone.comcast.net                                                                                                                                                                                                               73.6%   296  119.9  50.9  20.0 226.9  51.2
12. 50.208.235.198                                                                                                                                                                                                                                               48.0%   296   19.9  59.4  19.2 310.2  59.4
13. kanc-bb2-link.ip.twelve99.net                                                                                                                                                                                                                                 3.7%   296   45.4  85.5  39.6 269.3  60.9
14. kanc-b2-link.ip.twelve99.net                                                                                                                                                                                                                                  0.0%   296   45.0  83.2  41.2 307.7  57.3
15. nyk-bb2-link.ip.twelve99.net                                                                                                                                                                                                                                  0.0%   296   64.0 100.9  58.3 325.0  55.9
16. nyk-bb2-link.ip.twelve99.net                                                                                                                                                                                                                                  0.0%   296   61.8 100.2  56.2 279.3  56.9
17. ash-bb2-link.ip.twelve99.net                                                                                                                                                                                                                                  0.0%   296  208.7 101.8  59.9 271.7  56.1
18. ash-b2-link.ip.twelve99.net                                                                                                                                                                                                                                   0.0%   296  164.5 104.6  59.5 298.6  57.7
19. github-ic345016-ash-b2.ip.twelve99-cust.net                                                                                                                                                                                                                   0.0%   296  180.5 101.2  59.1 269.1  54.0
20. (waiting for reply)
21. (waiting for reply)
22. (waiting for reply)
23. lb-140-82-114-3-iad.github.com                                                                                                                                                                                                                                0.0%   296   63.9 101.9  60.7 283.6  53.2

XfinityJanelle

Official Employee

•

1.5K Messages

@jonnny333 If you can send us over a private message we can look further into your modem specs and see if anything is going on.

Could you please send our team a direct message with your full name and full address? Our team can most definitely take a further look at this https://comca.st/3tv9XKi send a "Direct Message" ("Private") message:
Click "Sign In" if necessary
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• Press Enter to send it

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3 years ago

user_93e3c9

Visitor

•

7 Messages

I'm running into the same problem connecting from my home to GitHub which is topping out at 1MiB/s. This is using an SSH link. I'm also seeing the same problem pulls over an ssh link from a hosted Gerrit service (which hosts a number of GIt repositories) with extremely slow downloads. Traceroutes are showing a very long time to get to the destination.

3 years ago

user_93e3c9

Visitor

•

7 Messages

3 years ago

I'm definitely seeing this problem at my home in Santa Clara CA, on a 500Mbps connection. If I restart the router and start a github clone over SSH it goes upto 15 MiB/s but then after a couple of minutes it grinds down to 300KiB/s. Is there anyway I can get some support on this? Its completely crippling my ability to do any work.

Your Home Network

jonnny333

GitHub Maxes Out at 1Mb/sec on 1G Connection

XfinityLinda

jonnny333

XfinityJanelle

user_93e3c9

user_93e3c9

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