linux-kernel - Re: to many sockets ?

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Message-ID: <4524CD61.5080904@web.de>
Date:	Thu, 05 Oct 2006 11:16:17 +0200
From:	Markus Wenke <M.Wenke@....de>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: to many sockets ?

Eric Dumazet schrieb:
> On Thursday 05 October 2006 10:20, Markus Wenke wrote:
>   
>> Eric Dumazet schrieb:
>>     
>
>   
>>> Could you post here the result of these commands when your system is
>>> using more than 100.000 connections (and before the OOM :) )
>>>       
>> Hi,
>>
>> here the results with 130001 connetions
>>
>>     
>>> cat /proc/meminfo
>>>       
>> MemTotal:      3108372 kB
>> MemFree:       2114404 kB
>> Buffers:          5112 kB
>> Cached:          97804 kB
>> SwapCached:          0 kB
>> Active:         140552 kB
>> Inactive:        38948 kB
>> HighTotal:     2228160 kB
>> HighFree:      2048108 kB
>> LowTotal:       880212 kB
>> LowFree:         66296 kB
>>     
>
> See here ? you have 'only' 880212 kB of LOWMEM, and 66 MB free.
> all kernel structures (you can see them in /proc/slabinfo) are lying on this 
> zone, no matter you add RAM on your machine (more RAM end up in HighMEM zone, 
> wich is basically unused on your setup)
>
> Since you have a 64bits CPU, your best move would be to use a 64bits kernel 
> (you can keep all user land in 32bits mode)
>
> With a 64bits kernel, kernel land structures would not be constrained in a 
> small area, but can use full RAM.
>
I think I change to the 64 Bit-Kernel ;-).


btw: with the Xen-patched Kernel I get this at 130000 connections:

MemTotal:      2979840 kB
MemFree:       2394544 kB
Buffers:          5748 kB
Cached:         104492 kB
SwapCached:          0 kB
Active:         146632 kB
Inactive:        43276 kB
HighTotal:     2136004 kB
HighFree:      1943728 kB
LowTotal:       843836 kB
LowFree:        450816 kB
SwapTotal:     2104472 kB
SwapFree:      2104472 kB
Dirty:             412 kB
Writeback:           0 kB
Mapped:          89556 kB
Slab:           285284 kB
CommitLimit:   3594392 kB
Committed_AS:   205244 kB
PageTables:        756 kB
VmallocTotal:   114680 kB
VmallocUsed:      4576 kB
VmallocChunk:   109280 kB

> I'm curious you have so many sockets but few entries in route cache... 
> basically all connections come from few machines ?
>
My test scenario has only 5 clients, so I must make the connections with 
a few clients.



Thanks a lot

Markus Wenke

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