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From: Kristian Rink <kawazu@zimmer428.net>
Date: Mon, 28 Jul 2008 15:19:37 +0200
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 <200807281321.13588.sabelka@iue.tuwien.ac.at>
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Subject: [users@httpd]  Re: mod_proxy and disconnections

Hi Rainer, *;

and first off, thanks for being patient enough reading through all the long
message to the very end, as well as for your comment on that. :)

Rainer Sabelka schrieb:
[...]
> I've observerd similar problems with large POST requests which sometimes time 
> out on the backend servers while the client is sending the request body (like 
> you with mod_proxy/apache 2.2  on Ubuntu 8.04).

Yes I am seeing upload/POST related issues once in a while, as well (looking
at the Java apps, they end up being something like "upload of
multipart/form-data failed, stream ended unexpectedly"). Seems to depend
upon the size of POSTs indeed, and happens significantly less often than the
download-related issue.

> But the whole issue might actually not be caused by apache at all, but by a 
> bug in the TCP implementation of the linux kernel 2.6.24. (See this thread: 
> http://marc.info/?t=121518334200003&r=1&w=2)
> For me setting /proc/sys/net/ipv4/tcp_frto to 0  helped to solve the problem 
> for a coulple of users, but not for everyone.

Thanks for the pointer, I will dig into this and see where it gets me,
however this issue did also exist in our "old" reverse proxy environment
(ubuntu 6.06.1, apache 2.0) so I think it is at least not completely Linux
2.6.24 related...

Cheers & good luck on that as well.
Kristian


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