linux-kernel - Re: [PATCH] fs: pipe/sockets/anon dentries should not have a parent

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Date:	Fri, 21 Nov 2008 16:28:29 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	David Miller <davem@...emloft.net>, cl@...ux-foundation.org,
	rjw@...k.pl, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org, efault@....de,
	a.p.zijlstra@...llo.nl, Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH] fs: pipe/sockets/anon dentries should not have a parent

Ingo Molnar a écrit :
> * Eric Dumazet <dada1@...mosbay.com> wrote:
> 
>> Before patch, time to run 8 millions of close(socket()) calls on 8 
>> CPUS was :
>>
>> real    0m27.496s
>> user    0m0.657s
>> sys     3m39.092s
>>
>> After patch :
>>
>> real    0m23.997s
>> user    0m0.682s
>> sys     3m11.193s
> 
> cool :-)
> 
> What would it take to get it down to:
> 
>>> Cost if run one one cpu :
>>>
>>> real    0m1.561s
>>> user    0m0.092s
>>> sys     0m1.469s
> 
> i guess asking for a wall-clock cost of 1.561/8 would be too much? :)
> 

It might be possible, depending on the level of hackery I am allowed to inject
in fs/dcache.c and fs/inode.c :)

wall cost of 1.56 (each cpu runs one loop of one million iterations)


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