Messages in this thread | | | Date | Wed, 02 Dec 2009 09:51:36 +0800 | From | Gui Jianfeng <> | Subject | Re: Block IO Controller V4 |
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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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