linux-kernel - Re: sysbench+mysql(oltp, readonly) 30% regression with 2.6.26-rc1

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Message-Id: <1210239454.7036.2.camel@marge.simson.net>
Date:	Thu, 08 May 2008 11:37:34 +0200
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: sysbench+mysql(oltp, readonly) 30% regression with 2.6.26-rc1


On Thu, 2008-05-08 at 10:46 +0200, Ingo Molnar wrote:

> Could you perhaps try the hack below that uses /proc/sys/kernel/panic as 
> a flag whether the BKL should cause us to block or should be spun upon.
> 
> Can you confirm that with that patch too sysbench shows sensitivity to 
> the value of the panic flag? [this is the surest way to measure such 
> effects as flipping the sysctl only minimally impacts the system.]

Difference for average of 3 runs at 128 clients is 0.3% with this
patch.. iow, nope.

	-Mike

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