linux-kernel - Re: [RFC] IO scheduler based IO controller V6

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Message-ID: <20090708143925.GE3215@balbir.in.ibm.com>
Date:	Wed, 8 Jul 2009 20:09:25 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	dhaval@...ux.vnet.ibm.com, snitzer@...hat.com, dm-devel@...hat.com,
	jens.axboe@...cle.com, agk@...hat.com, paolo.valente@...more.it,
	fernando@....ntt.co.jp, jmoyer@...hat.com, fchecconi@...il.com,
	akpm@...ux-foundation.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, righi.andrea@...il.com
Subject: Re: [RFC] IO scheduler based IO controller V6

* Vivek Goyal <vgoyal@...hat.com> [2009-07-08 09:41:14]:

> On Wed, Jul 08, 2009 at 09:26:21AM +0530, Balbir Singh wrote:
> > * Vivek Goyal <vgoyal@...hat.com> [2009-07-02 16:01:32]:
> > 
> > > 
> > > Hi All,
> > > 
> > > Here is the V6 of the IO controller patches generated on top of 2.6.31-rc1.
> > > 
> > > Previous versions of the patches was posted here.
> > > 
> > > (V1) http://lkml.org/lkml/2009/3/11/486
> > > (V2) http://lkml.org/lkml/2009/5/5/275
> > > (V3) http://lkml.org/lkml/2009/5/26/472
> > > (V4) http://lkml.org/lkml/2009/6/8/580
> > > (V5) http://lkml.org/lkml/2009/6/19/279
> > > 
> > > This patchset is still work in progress but I want to keep on getting the
> > > snapshot of my tree out at regular intervals to get the feedback hence V6.
> > >
> > 
> > Hi, Vivek,
> > 
> > I was able to compile and boot a 2.6.31-rc1 kernel with this patchset.
> > I have a request could you fold up all patches and make one
> > consolidated patch available somewhere (makes it easier to test), may
> > be a git tree?
> > 
> 
> Thanks for trying it out balbir. Ok, for ease of patching and testing, I 
> will also maintain a consolidated patch. For V6 you can download the patch
> from here.
> 
> http://people.redhat.com/~vgoyal/io-controller/io-scheduler-based-io-controller-v6.patch
>

Thanks, this will definitely help me get more testing done!
 
> > I did some quick tests with some io benchmarks and found in a simple
> > scenario that the scheduler worked as expected, except that it took
> > very long. I'll investigate further and revert back.
> 
> Thanks. I will wait for details.
>

I'll try and send something out by Friday, but for now I am not even
very sure if it is a real problem. I ran iozone on two groups with 500
and 1000 as weights on the same parition and set fairness to 1 in
sysfs for the partition. I used a record size of 4 (default) and tried
to run it on a file size of 1G.

BTW, I don't see anything about weights being multiple of an expected
figure documented anywhere. I tried weights of 1024 (similar to the
scheduler and got shouted back at :) ). Does the documentation patch
specify the expected range for weights? 

-- 
	Balbir
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