linux-kernel - Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs unpinnede

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Message-ID: <20110913183502.GP11100@linux.vnet.ibm.com>
Date:	Wed, 14 Sep 2011 00:05:02 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Paul Turner <pjt@...gle.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelianov <xemul@...allels.com>
Subject: Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs
 unpinnede

* Peter Zijlstra <a.p.zijlstra@...llo.nl> [2011-09-13 20:30:46]:

> On Tue, 2011-09-13 at 23:58 +0530, Srivatsa Vaddagiri wrote:
> > * Peter Zijlstra <a.p.zijlstra@...llo.nl> [2011-09-13 20:19:55]:
> > 
> > > On Tue, 2011-09-13 at 23:24 +0530, Srivatsa Vaddagiri wrote:
> > > > We saw considerably high migration count on latest tip compared to
> > > > previous kernels. Kamalesh, can you please post the migration count
> > > > data? 
> > > 
> > > Hrmm, yes this looks horrid.. even without cgroup crap, something's funny.
> > 
> > Yes ..we could visualize that very much in top o/p .. A task's cpu would keep 
> > changing *every* screen refresh (refreshed every 0.5 sec that too!).
> > 
> > We didn't see that with older kernels ..Kamalesh is planning to do a
> > git bisect and see which commit lead to this "mad" hopping ..
> 
> Awesome, thanks! Btw, what is 'older'? 3.0?

We went back all the way upto 2.6.32! I think 2.6.38 and 2.6.39 were
pretty stable ..I don't have the migration count data with me readily. I
will let Kamalesh post that info soon.

- vatsa

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