linux-kernel - Re: [RFC] IO scheduler based io controller (V5)

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Date:	Mon, 22 Jun 2009 11:40:42 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	jens.axboe@...cle.com, nauman@...gle.com, dpshah@...gle.com,
	lizf@...fujitsu.com, mikew@...gle.com, fchecconi@...il.com,
	paolo.valente@...more.it, ryov@...inux.co.jp,
	fernando@....ntt.co.jp, s-uchida@...jp.nec.com, taka@...inux.co.jp,
	guijianfeng@...fujitsu.com, dhaval@...ux.vnet.ibm.com,
	righi.andrea@...il.com, m-ikeda@...jp.nec.com, jbaron@...hat.com,
	agk@...hat.com, snitzer@...hat.com, akpm@...ux-foundation.org,
	peterz@...radead.org
Subject: Re: [RFC] IO scheduler based io controller (V5)

Vivek Goyal <vgoyal@...hat.com> writes:

> On Sun, Jun 21, 2009 at 08:51:16PM +0530, Balbir Singh wrote:
>> * Vivek Goyal <vgoyal@...hat.com> [2009-06-19 16:37:18]:
>> 
>> > 
>> > Hi All,
>> > 
>> > Here is the V5 of the IO controller patches generated on top of 2.6.30.
>> [snip]
>> 
>> > Testing
>> > =======
>> >
>> 
>> [snip]
>> 
>> I've not been reading through the discussions in complete detail, but
>> I see no reference to async reads or aio. In the case of aio, aio
>> presumes the context of the user space process. Could you elaborate on
>> any testing you've done with these cases? 
>> 
>
> Hi Balbir,
>
> So far I had not done any testing with AIO. I have done some just now.
> Here are the results.
>
> Test1 (AIO reads)
> ================
> Set up two fio, AIO read jobs in two cgroup with weight 1000 and 500
> respectively. I am using cfq scheduler. Following are some lines from my test
> script.
>
> ===================================================================
> fio_args="--ioengine=libaio --rw=read --size=512M"

AIO doesn't make sense without O_DIRECT.

Cheers,
Jeff
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