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

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Message-ID: <20081121152148.GA20388@elte.hu>
Date:	Fri, 21 Nov 2008 16:21:48 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Eric Dumazet <dada1@...mosbay.com>
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


* 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? :)

	Ingo
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