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Subject: Re: sysbench+mysql(oltp, readonly) 30% regression with 2.6.26-rc1
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Cc: Mike Galbraith <efault@gmx.de>, LKML <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>
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> > > -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.