Re: EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes?

[Andreas Dilger]

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.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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