Hi Carlo! On Fri, 22 Jun 2007, Carlo Wood wrote:
> On Fri, Jun 22, 2007 at 06:17:46PM -0300, Henrique de Moraes Holschuh wrote: > > On Fri, 22 Jun 2007, Carlo Wood wrote: > > > So far I found out that it's RAID only. > > > > If you change the IO schedulers, does it help? > > How do I do that? for i in /sys/block/sd*/queue/scheduler ; do echo -n "scheduler for $i was:" ; cat $i ; echo anticipatory > $i ; done Should show you the scheduler for all libata/scsi discs, and switch to anticipatory. It probably works for hd* as well, but I don't have any around to test. I had ridiculous md raid performance (on resync) using cfq at least once. Unfortunately I never bothered trying to track it down, and I didn't check the throughput after the resync was done either. Also, I don't recall the kernel version, but it was either 2.6.18 or 2.6.20. Since it is a very simple test... -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/