netdev - Re: TCP connection stops after high load.

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Date:	Sun, 15 Apr 2007 16:52:57 +0300
From:	"Robert Iakobashvili" <coroberti@...il.com>
To:	"David Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, greearb@...delatech.com
Subject: Re: TCP connection stops after high load.

On 4/13/07, David Miller <davem@...emloft.net> wrote:
> From: "Robert Iakobashvili" <coroberti@...il.com>
> Date: Thu, 12 Apr 2007 23:11:14 +0200
>
> > It works good with  2.6.11.8 and debian 2.6.18.3-i686 image.
> >
> > At the same Intel Pentium-4 PC with the same about kernel configuration
> > (make oldconfig using Debian config-2.6.18.3-i686) the setup fails with the
> > tcp-connections stalled after 1000 established connections when the kernel
> > is 2.6.20.6 or 2.6.19.5.
> >
> > It stalls even earlier, when lighttpd used with the default (poll ())
> > demultiplexing
> > after 500 connections or when apache2 web server used (memory?) - after 100
> > connections.
> >
> > I am currently going to try vanilla 2.6.18.3 and, if with it also
> > fails, to look through
> > Debian patches, trying to figure out, what is the delta.

>Vanilla 2.6.18.3 works for me perfectly, whereas 2.6.19.5 and
2.6.20.6 do not.
>
>Looking into the tcp /proc entries of 2.6.18.3 versus 2.6.19.5
>tcp_rmem and tcp_wmem are the same, whereas tcp_mem are
>much different:
>
>kernel                  tcp_mem
>---------------------------------------
>2.6.18.3    12288 16384 24576
>2.6.19.5      3072    4096   6144
>
>
>Is not it done deliberately by the below patch:
>
>commit 9e950efa20dc8037c27509666cba6999da9368e8
>Author: John Heffner <jheffner@....edu>
>Date:   Mon Nov 6 23:10:51 2006 -0800

Sorry, the commit is innocent. Something else has been
broken in tcp_mem initialization logic.

>My machine has:
>MemTotal:       484368 kB
>and
>for all kernel configurations are actually the same with
>CONFIG_HIGHMEM4G=y

Sincerely,
Robert Iakobashvili,
coroberti %x40 gmail %x2e com
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