linux-kernel - Re: [PATCH 0/2] fix the itimer regression (BZ 12618)

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Date:	Mon, 09 Feb 2009 14:46:01 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"seto.hidetoshi@...fujitsu.com" <seto.hidetoshi@...fujitsu.com>
Subject: Re: [PATCH 0/2] fix the itimer regression (BZ 12618)

On Fri, 2009-02-06 at 23:18 +0800, Ingo Molnar wrote:
> * Zhang, Yanmin <yanmin_zhang@...ux.intel.com> wrote:
> 
> > On Thu, 2009-02-05 at 13:06 +0100, Ingo Molnar wrote:
> > > * Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> > > 
> > > > This should hopefully address all the itimer borkage.
> > > 
> > > Applied to tip:timers/urgent, thanks Peter!
> > > 
> > > Yanmin: could you check hacbench_pth with latest tip/master, do
> > > these fixes resolve that 3% regression you reported?
> >
> > Lin Ming tested it and hackbench_pth/volanoMark regression all disappear. 
> > But oltp has a regression. We think oltp new regression isn't related to 
> > the patch. Ming is investigating it.
> 
> Potential suspects for oltp regression would be:
> 
>  3d39870: sched_rt: don't use first_cpu on cpumask created with cpumask_and
>  a571bbe: sched: fix buddie group latency
>  a9f3e2b: sched: clear buddies more aggressively
>  1596e29: sched: symmetric sync vs avg_overlap
>  d942fb6: sched: fix sync wakeups

I tested the latest tip-master branch.
After reverting "d942fb6: sched: fix sync wakeups", the oltp regression
on the 8cores Stockley machine is mostly fixed.

On another 4*4 cores Tigerton machine, oltp has more than 10% regression
with 2.6.29-rc4 compared with 2.6.29-rc3.

Lin Ming

> 
> 	Ingo

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