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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4926D39D.9050603@cosmosbay.com>
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)


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html