[Apt-cacher-ng-users] slow "apt-get update" via apt-cacher-ng

[Eduard Bloch]

Hallo,
* Kirill Timofeev [Mon, Jul 28 2014, 11:43:13PM]:
> Hi Eduard,
> 
> thank you very much for quick response. Please find log attached. Here is
> command I used to obtain this log:
> 
> root at els-trusty-test-02:~# time apt-get update -o Debug::Acquire::Http=true
> >apt-cacher-ng-slow-update.log 2>&1
> 
> real    0m39.796s
> user    0m4.212s
> sys     0m0.626s

> Ign http://us.archive.ubuntu.com trusty InRelease
> HTTP/1.1 500 Internal Server Error
> Content-Length: 0
> Date: Tue Jul 29 06:40:20 2014
> Server: Debian Apt-Cacher NG/0.7.26
> X-Original-Source: http://pkg.prod.hulu.com/deb/dists/trusty/Release.gpg
> Connection: Keep-Alive

There is a lot of such error messages in your log. However,
apt-cacher-ng does not generate them! There is only one similar string
in the source which uses different letter case ("500 Internal server error").

This leads me to the assumption that you must have something inbetween
(another proxy that rewrites the responses incorrectly?) which goes nuts.
Maybe a transparent proxy which you don't know anything about?

If that assumption is correct, you might play around with PipelineDepth
option until you find a value which this proxy is willing/capable to
handle.

Regards,
Eduard.