[Python-Dev] Problem with svn on community buildbot

[Alexander Belopolsky]

I don't know is this is related, but from my end, access to
svn.python.org has been extremely slow recently:

$ time curl -o /dev/null http://svn.python.org
 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                Dload  Upload   Total   Spent    Left  Speed
100   353  100   353    0     0      4      0  0:01:28  0:01:15  0:00:13     0

real    1m15.045s
user    0m0.004s
sys     0m0.004s


I've seen similar slowdowns accessing bugs.python.org, but not now.

It looks like it has something to do with IPv6:

$ host svn.python.org
svn.python.org has address 82.94.164.164
svn.python.org has IPv6 address 2001:888:2000:d::a4

$ time curl -v -o /dev/null http://svn.python.org
* About to connect() to svn.python.org port 80 (#0)
*   Trying 2001:888:2000:d::a4... Operation timed out
*   Trying 82.94.164.164... connected
...

No slowdown when IPv6 lookup is disabled with -4 option to curl:

$ time curl -4 -o /dev/null http://svn.python.org
 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                Dload  Upload   Total   Spent    Left  Speed
100   353  100   353    0     0    774      0 --:--:-- --:--:-- --:--:--     0

real    0m0.463s
user    0m0.004s
sys     0m0.004s

On Sun, Dec 14, 2008 at 8:58 AM,  <skip at pobox.com> wrote:
>
>    Martin> Well - can you resolve `svn.python.org' on that machine
>    Martin> (e.g. when using ping(1))?
>
> Yup:
>
>    $ host svn.python.org
>    svn.python.org has address 82.94.164.164
>    svn.python.org has IPv6 address 2001:888:2000:d::a4
>    $ ping svn.python.org
>    PING svn.python.org (82.94.164.164): 56 data bytes
>    64 bytes from 82.94.164.164: icmp_seq=0 ttl=50 time=134.041 ms
>    64 bytes from 82.94.164.164: icmp_seq=1 ttl=50 time=135.441 ms
>    64 bytes from 82.94.164.164: icmp_seq=2 ttl=50 time=135.352 ms
>    ^C
>    --- svn.python.org ping statistics ---
>    3 packets transmitted, 3 packets received, 0% packet loss
>    round-trip min/avg/max/stddev = 134.041/134.945/135.441/0.640 ms
>    $ telnet svn.python.org 80
>    Trying 82.94.164.164...
>    Connected to svn.python.org.
>    Escape character is '^]'.
>    ^]
>    telnet> quit
>    Connection closed.
>
> Skip
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