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

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Date:	Fri, 09 May 2008 09:32:42 +0200
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: sysbench+mysql(oltp, readonly) 30% regression with 2.6.26-rc1


On Fri, 2008-05-09 at 08:51 +0200, Peter Zijlstra wrote:
> > > > -rc1.  Do you have the fix below applied?
> > > 
> > > Oooh - good catch, that seems to be a post -rc1 merge.
> > > 
> > > Yes this is required.
> 
> > With below patch+previous_fix_weight_calc, the result is improved, but is still
> > about 10% worse than the one of pure 2.6.26-rc1.
> > Number of threads: 16
> >     read/write requests:                 6104336 (50867.11 per sec.)
> > 
> 
> So puzzling - could you try -git + fix_weight_calc, as I think that is
> what Mike tested and proved good on his Quad.

If he still has group scheduling enabled, my box agrees that there's a
regression.  I got mysql running, and tested with group scheduling both
enabled and disabled, results attached.  (for some reason, I can only
test up to 64 threads with mysql though)

	-Mike

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