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Date: Tue, 04 Mar 2008 00:23:59 +0100
From: Andi Kleen <andi@...stfloor.org>
To: Cyrus Massoumi <cyrusm@....net>
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
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.
-Andi
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