linux-kernel - Re: SMP performance degradation with sysbench

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Message-Id: <1172768226.5419.9.camel@odyssey.lan>
Date:	Thu, 01 Mar 2007 17:57:05 +0100
From:	Lorenzo Allegrucci <l.allegrucci@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	"\"J.A." Magallón" <jamagallon@....com>,
	Hiro Yoshioka <hyoshiok@...aclelinux.com>, davej@...hat.com,
	harlan@...select.com, nickpiggin@...oo.com.au,
	linux-kernel@...r.kernel.org, mingo@...e.hu, suparna@...ibm.com,
	jens.axboe@...cle.com
Subject: Re: SMP performance degradation with sysbench

On Tue, 2007-02-27 at 20:05 +0100, Lorenzo Allegrucci wrote:
> On Tue, 2007-02-27 at 09:02 -0500, Rik van Riel wrote:
> > That still doesn't fix the potential Linux problem that this
> > benchmark identified.
> > 
> > To clarify: I don't care as much about MySQL performance as
> > I care about identifying and fixing this potential bug in
> > Linux.
> 
> Here http://people.freebsd.org/~kris/scaling/mysql.html Kris Kennaway
> talks about a patch for FreeBSD 7 which addresses poor scalability
> of file descriptor locking and that it's responsible for almost all
> of the performance and scaling improvements.

How does Linux scale with many threads contending for file descriptor
lock?
Has anyone tried to run the test with oprofile?


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