linux-kernel - Re: [PATCH 12/23] io-controller: Wait for requests to complete from last queue before new queue is scheduled

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Message-ID: <4A99CA64.9090807@redhat.com>
Date:	Sat, 29 Aug 2009 20:40:04 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	containers@...ts.linux-foundation.org, dm-devel@...hat.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, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	righi.andrea@...il.com, m-ikeda@...jp.nec.com, agk@...hat.com,
	akpm@...ux-foundation.org, peterz@...radead.org,
	jmarchan@...hat.com, torvalds@...ux-foundation.org, mingo@...e.hu
Subject: Re: [PATCH 12/23] io-controller: Wait for requests to complete from
 last queue before new queue is scheduled

Vivek Goyal wrote:

> o Because above behavior can result in reduced throughput, this behavior will
>   be enabled only if user sets "fairness" tunable to 1.
> 
> o This patch helps in achieving more isolation between reads and buffered
>   writes in different cgroups. 

Could be a nice help against SATA NCQ request starvation.

> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

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