Messages in this thread | | | Date | Mon, 13 Apr 2009 08:54:52 +0400 | From | "Alexander V. Lukyanov" <> | Subject | Re: 2.6.29.1 vs 2.6.27.21 ext4 performance problem |
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On Fri, Apr 10, 2009 at 12:36:20PM -0400, Theodore Tso wrote: > Does the differences go away if you do echo 0 into > /sys/fs/ext4/<dev>/inode_readahead_blks?
Yes! Thanks for the tip. I think the problem here is that there are lots of files (2M per file system) and the access is random.
> Are you seeing an increase in time, or decrease in transactions per > second, or just that there is is an increase in read rates?
Load average goes up from 6 to 30, and request latency increases.
-- Alexander..
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