linux-kernel - Re: ZONE_NORMAL memory exhausted by 4000 TCP sockets

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Date:	Mon, 6 Nov 2006 10:22:57 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	"Zhao Xiaoming" <xiaoming.nj@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"Linux Netdev List" <netdev@...r.kernel.org>
Subject: Re: ZONE_NORMAL memory exhausted by 4000 TCP sockets

On Monday 06 November 2006 09:59, Zhao Xiaoming wrote:

> Thank you again for your help. To have more detailed statistic data, I
> did another round of test and gathered some data.  I give the overall
> description here and detailed /proc/net/sockstat, /proc/meminfo,
> /proc/slabinfo and /proc/buddyinfo follows.
> =====================================================
>                            slab mem cost        tcp mem pages       lowmem
> free with traffic:             254668KB                 34693
>       38772KB
> without traffic:       104080KB                           1
>        702652KB
> =====================================================

Thank you for detailed infos.

It appears you have an extensive use of threads (about 10000), since :

> task_struct        10095  10095   1360    3    1 : tunables   24   12
>   8 : slabdata   3365   3365      0

Each thread has a kernel stack, 8KB (ie 2 pages, order-1 allocation), plus a 
user vma

> vm_area_struct     21346  21504     92   42    1 : tunables  120   60
>   8 : slabdata    512    512      0

Most likely you dont need that much threads. A program with fewer threads will 
perform better and use less ram.

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