linux-kernel - Re: 2.6.25-rc1: volanoMark 45% regression

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Date:	Mon, 18 Feb 2008 14:05:45 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	vatsa@...ux.vnet.ibm.com, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: 2.6.25-rc1: volanoMark 45% regression

On Mon, 2008-02-18 at 10:52 +0530, Balbir Singh wrote:
> Zhang, Yanmin wrote:
> > On Mon, 2008-02-18 at 10:26 +0530, Balbir Singh wrote:
> >> Zhang, Yanmin wrote:
> >>>>>  Did you have
> >>>>> CONFIG_FAIR_USER_SCHED enabled in both cases?
> >>>> Yes.
> >>>>
> >>>> CONFIG_FAIR_GROUP_SCHED=y
> >>>> CONFIG_FAIR_USER_SCHED=y
> >>>>
> >> Interesting that you have CONFIG_FAIR_USER_SCHED. Do you have any other users on
> >> the system (are they running anything at the time of the benchmark)?
> > No. As for volanoMark, I start volanoMark both server and client processes while
> > starting some system measurement tools such like vmstat/iostat/sar. All the processes
> > run under the same user.
> > 
> 
> Ok, so the bandwidth is not split between users, which is very good. I assume
> the same user is root?
No. I use an ordinary user.

> 
> > 
> >>  Could you
> >> turn off CONFIG_FAIR_USER_SCHED  and turn on CONFIG_FAIR_GROUP_SCHED.
> > I will try.
> > 
> >>  I am going
> >> to run some tests with 2.6.25-rc2 and Volanomark and see how that goes.
> > Pls. set /proc/sys/kernel/sched_compat_yield=1 before starting test.
> 
> Thanks for the tip, I would have definitely missed this one
I use Jrockit JVM and enables hugetlb, but I don't think hugetlb has too much help on
volanoMark, especially for the regression tracking.

-yanmin


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