On Fri, Jul 01 2005, Miller, Mike (OS Dev) wrote: > 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. Unfortunately I don't have any hardware at hand for testing, so I cannot do it myself. Would be appreciated! -- Jens Axboe - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
