linux-kernel - Re: [Bug #11207] VolanoMark regression with 2.6.27-rc1

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Message-Id: <1223433391.1685.19.camel@ymzhang>
Date:	Wed, 08 Oct 2008 10:36:31 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Miao Xie <miaox@...fujitsu.com>
Subject: Re: [Bug #11207] VolanoMark regression with 2.6.27-rc1


On Tue, 2008-10-07 at 17:48 +0200, Peter Zijlstra wrote:
> On Wed, 2008-10-08 at 02:11 +1100, Nick Piggin wrote:
> > On Sunday 05 October 2008 04:28, Rafael J. Wysocki wrote:
> > > This message has been generated automatically as a part of a report
> > > of recent regressions.
> > >
> > > The following bug entry is on the current list of known regressions
> > > from 2.6.26.  Please verify if it still should be listed and let me know
> > > (either way).
> > >
> > >
> > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=11207
> > > Subject		: VolanoMark regression with 2.6.27-rc1
> > > Submitter	: Zhang, Yanmin <yanmin_zhang@...ux.intel.com>
> > > Date		: 2008-07-31 3:20 (66 days old)
> > > References	: http://marc.info/?l=linux-kernel&m=121747464114335&w=4
> > > Handled-By	: Zhang, Yanmin <yanmin_zhang@...ux.intel.com>
> > > 		  Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > > 		  Dhaval Giani <dhaval@...ux.vnet.ibm.com>
> > > 		  Miao Xie <miaox@...fujitsu.com>
> > 
> > Curious: what's happening with this one, handlers? Any progress being made?
> 
> Sadly not much, I can't seem to reproduce :-(
The regression is bigger with more cpu.

> 
> Yanmin, does the wakeup patch I did for oltp help this workload any?
> 
> http://marc.info/?l=linux-kernel&m=122194673932703&w=4
I tested it against 2.6.29-rc9 on 8-core stoakley and 16-core tigerton. volanoMark
chatroom number is default 10.
Basically, comparing with pure 2.6.27-rc9, the patched kernel's result has about 2%
regression. Group scheduling is enabled.

-yanmin


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