Justin Piszcz wrote: > > On Mon, 1 Mar 2010, Andreas Dilger wrote: > >> On 2010-02-28, at 07:55, Justin Piszcz wrote: >>> === CREATE RAID-0 WITH 11 DISKS >> >> Have you tried testing with "nice" numbers of disks in your RAID set >> (e.g. 8 disks for RAID-0, 9 for RAID-5, 10 for RAID-6)? The mballoc >> code is really much better tuned for power-of-two sized allocations. > > Hi, > > Yes, the second system (RAID-5) has 8 disks and it shows the same > performance problems with ext4 and not XFS (as shown from previous > e-mail), where XFS usually got 500-600MiB/s for writes. > > http://groups.google.com/group/linux.kernel/browse_thread/thread/e7b189bcaa2c1cb4/ad6c2a54b678cf5f?show_docid=ad6c2a54b678cf5f&pli=1 > > > For the RAID-5 (from earlier testing): <- This one has 8 disks. Note that for RAID-5, the "nice" number of disks is 9 as Andreas said, not 8 as in your example. /mjt -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
