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Date:	Wed, 02 Dec 2009 09:51:36 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	ryov@...inux.co.jp, fernando@....ntt.co.jp, s-uchida@...jp.nec.com,
	taka@...inux.co.jp, jmoyer@...hat.com, righi.andrea@...il.com,
	m-ikeda@...jp.nec.com, czoccolo@...il.com, Alan.Brunelle@...com
Subject: Re: Block IO Controller V4

Vivek Goyal wrote:
> Hi Jens,
> 
> This is V4 of the Block IO controller patches on top of "for-2.6.33" branch
> of block tree.
> 
> A consolidated patch can be found here:
> 
> http://people.redhat.com/vgoyal/io-controller/blkio-controller/blkio-controller-v4.patch
> 

Hi Vivek,

It seems this version doesn't work very well for "direct(O_DIRECT) sequence read" mode.
For example, you can create group A and group B, then assign weight 100 to group A and
weight 400 to group B, and you run "direct sequence read" workload in group A and B 
simultaneously. Ideally, we should see 1:4 disk time differentiation for group A and B. 
But actually, I see almost 1:2 disk time differentiation for group A and B. I'm looking
into this issue.
BTW, V3 works well for this case.

Thanks,
Gui

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