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Date:	Wed, 02 Dec 2009 09:51:36 +0800
From:	Gui Jianfeng <>
To:	Vivek Goyal <>
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:

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.


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