Messages in this thread | | | Date | Mon, 1 Mar 2010 04:21:03 -0500 (EST) | From | Justin Piszcz <> | Subject | Re: EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes? |
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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. -o data=writeback,nobarrier: 10737418240 bytes (11 GB) copied, 48.7335 s, 220 MB/s -o data=writeback,nobarrier,nodelalloc: 10737418240 bytes (11 GB) copied, 30.5425 s, 352 MB/s An increase of 132MiB/s.
Justin.
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