linux-kernel - Re: [RFC] IO scheduler based IO controller V9

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Date:	Wed, 02 Sep 2009 08:58:38 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.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, 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, riel@...hat.com
Subject: Re: [RFC] IO scheduler based IO controller V9

Vivek Goyal wrote:
> Hi All,
> 
> Here is the V9 of the IO controller patches generated on top of 2.6.31-rc7.
> 
> For ease of patching, a consolidated patch is available here.
> 
> http://people.redhat.com/~vgoyal/io-controller/io-scheduler-based-io-controller-v9.patch
> 
> Changes from V8
> ===============
> - Implemented bdi like congestion semantics for io group also. Now once an
>   io group gets congested, we don't clear the congestion flag until number
>   of requests goes below nr_congestion_off.
> 
>   This helps in getting rid of Buffered write performance regression we
>   were observing with io controller patches.
> 
>   Gui, can you please test it and see if this version is better in terms
>   of your buffered write tests.

Hi Vivek,

Here are some performance numbers generated by fio test. It seems V9 performance is better
than V8 especially for write case.

                         Normal Read  |  Random Read  |  Normal Write  |  Random Write

V8(Avg of 3 timers)      64667 KiB/s     3387 KiB/s      59197 KiB/s      9327 KiB/s 

V9(Avg of 3 timers)      65947 KiB/s     3528 KiB/s      61654 KiB/s      9744 KiB/s

Performance              +2.0%           +4.1%           +4.2%            +4.5%



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