linux-kernel - Re: Performance versus FreeBSD 7.0

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Date:	Tue, 04 Mar 2008 06:51:41 +0100
From:	Cyrus Massoumi <cyrusm@....net>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Nick Piggin <nickpiggin@...oo.com.au>,
	Diego Calleja <diegocg@...il.com>,
	Stephen Cuppett <cuppett@...il.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, a.p.zijlstra@...llo.nl
Subject: Re: Performance versus FreeBSD 7.0

Andi Kleen wrote:
> Cyrus Massoumi <cyrusm@....net> writes:
>> IIRC, going to fine-grained file locking gave them a huge boost in
>> this particular benchmark (and maybe others).
> 
> What locking? You mean their equivalent of i_mutex? There are 
> already file systems on Linux that don't use it significantly
> for write.
> 
>> As I said on lwn.net Peter Zijlstra posted a patch to break the global
>> file list lock about a year ago [1], but I don't think it was ever
>> merged. Here [2] are some numbers for the patchset.
> 
> The file_list_lock is only for open/close which MySQL is very unlikely
> to do in its fast path. You're totally on the wrong path here I think.

Yes, Nick already corrected me, sorry for the noise :)

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