linux-kernel - Re: dm-ioband: Test results.

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Message-ID: <20090421135723.GA13953@redhat.com>
Date:	Tue, 21 Apr 2009 09:57:23 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	device-mapper development <dm-devel@...hat.com>
Cc:	nauman@...gle.com, fernando@....ntt.co.jp,
	linux-kernel@...r.kernel.org, jmoyer@...hat.com, vgoyal@...hat.com,
	jens.axboe@...cle.com, agk@...hat.com, balbir@...ux.vnet.ibm.com
Subject: Re: dm-ioband: Test results.

On Tue, Apr 21 2009 at  8:10am -0400,
Ryo Tsuruta <ryov@...inux.co.jp> wrote:

> Hi Nauman,
> 
> > > The real question is, once you create a version of dm-ioband that
> > > co-operates with CFQ scheduler, how that solution would compare with
> > > the patch set Vivek has posted? In my opinion, we need to converge to
> > > one solution as soon as possible, so that we can work on it together
> > > to refine and test it.
> > 
> > I think I can do some help for your work. but I want to continue the
> > development of dm-ioband, because dm-ioband actually works well and
> > I think it has some advantages against other IO controllers.
> >   - It can use without cgroup.
> >   - It can control bandwidth on a per partition basis.
> >   - The driver module can be replaced without stopping the system.
> 
> In addition, dm-ioband can run on the RHEL5.

RHEL5 compatibility does not matter relative to merging an I/O bandwidth
controller upstream.  So both the "can [be] use without cgroup" and "can
run on RHEL5" features do not help your cause of getting dm-ioband
merged upstream.  In fact these features serve as distractions.

Mike
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