Messages in this thread | | | Subject | RE: [PATCH 1/1] cciss per disk queue for 2.6 | Date | Fri, 1 Jul 2005 11:53:33 -0500 | From | "Miller, Mike (OS Dev)" <> |
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Jens Axboe wrote: > Different thing, I'm talking about single volume starvation, > not volume-to-volume. > > > elevator algoritm(s) may be causing writes to starve reads > on the same > > logical volume. We continue to investigate our other > performance issues. > > I completely disagree. Even with an intelligent io scheduler, > starvation is seen on ciss that does not happen on other > queueing hardware such as 'normal' scsi controllers/drives. > So something else is going on, and the only 'fix' so far is > to limit the ciss queue depth heavily.
We will investigate this further and come up with a solution. Could be the firmware, I suppose.
mikem
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