linux-kernel - Re: IO scheduler based IO Controller V2

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Date:	Wed, 6 May 2009 09:12:54 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>, nauman@...gle.com,
	dpshah@...gle.com, lizf@...fujitsu.com, mikew@...gle.com,
	fchecconi@...il.com, paolo.valente@...more.it,
	jens.axboe@...cle.com, ryov@...inux.co.jp, fernando@....ntt.co.jp,
	s-uchida@...jp.nec.com, taka@...inux.co.jp,
	guijianfeng@...fujitsu.com, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, righi.andrea@...il.com,
	agk@...hat.com, dm-devel@...hat.com, snitzer@...hat.com,
	m-ikeda@...jp.nec.com
Subject: Re: IO scheduler based IO Controller V2

* Peter Zijlstra <peterz@...radead.org> [2009-05-06 00:20:49]:

> On Tue, 2009-05-05 at 13:24 -0700, Andrew Morton wrote:
> > On Tue,  5 May 2009 15:58:27 -0400
> > Vivek Goyal <vgoyal@...hat.com> wrote:
> > 
> > > 
> > > Hi All,
> > > 
> > > Here is the V2 of the IO controller patches generated on top of 2.6.30-rc4.
> > > ...
> > > Currently primarily two other IO controller proposals are out there.
> > > 
> > > dm-ioband
> > > ---------
> > > This patch set is from Ryo Tsuruta from valinux.
> > > ...
> > > IO-throttling
> > > -------------
> > > This patch set is from Andrea Righi provides max bandwidth controller.
> > 
> > I'm thinking we need to lock you guys in a room and come back in 15 minutes.
> > 
> > Seriously, how are we to resolve this?  We could lock me in a room and
> > cmoe back in 15 days, but there's no reason to believe that I'd emerge
> > with the best answer.
> > 
> > I tend to think that a cgroup-based controller is the way to go. 
> > Anything else will need to be wired up to cgroups _anyway_, and that
> > might end up messy.
> 
> FWIW I subscribe to the io-scheduler faith as opposed to the
> device-mapper cult ;-)
> 
> Also, I don't think a simple throttle will be very useful, a more mature
> solution should cater to more use cases.
>

I tend to agree, unless Andrea can prove us wrong. I don't think
throttling a task (not letting it consume CPU, memory when its IO
quota is exceeded) is a good idea. I've asked that question to Andrea
a few times, but got no response.
 

-- 
	Balbir
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