linux-kernel - Re: to many sockets ?

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Date:	Thu, 5 Oct 2006 09:58:37 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Markus Wenke <M.Wenke@....de>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: to many sockets ?

On Thursday 05 October 2006 09:14, Markus Wenke wrote:

> I tried the same scenario with SO_SNDBUF = SO_RCVBUF = 8k, so that the
> max memory is ca. 2G
> and the oom-killer kills my application at the same time (at 140000
> connections).
>
> I can not see in the messages that the system is out of memory,
> there is also no swap space used
>
> You can download my /var/log/messages at
> http://hemaho.mine.nu/~biber/messages
>
> May you can give me a hint which line/value in the log shows me,
> that the system is out of memory?

I think you lack of LOWMEM, since you use a 32bits kernel.

Could you post here the result of these commands when your system is using 
more than 100.000 connections (and before the OOM :) )

cat /proc/meminfo
cat /proc/slabinfo
cat /proc/net/sockstat
cat /proc/net/stat/rt_cache
cat /proc/buddyinfo
grep . /proc/sys/net/ipv4/*
grep . /proc/sys/net/ipv4/route/*

Eric
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