Re: linux deadline i/o elevator tuning

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On Apr 10, 2009, at 2:47 AM, Albe Laurenz *EXTERN* wrote:

Grzegorz Jaskiewicz wrote:
acording to kernel folks, anticipatory scheduler is even better for dbs. Oh well, it probably means everyone has to test it on their own at the
end of day.

In my test case, noop and deadline performed well, deadline being a little
better than noop.

Both anticipatory and CFQ sucked big time.


This is my experience as well, I posted about playing with the scheduler a while ago on -performance, but I can't seem to find it.

If you have a halfway OK raid controller, CFQ is useless. You can fire up something such as pgbench or pgiosim, fire up an iostat and then watch your iops jump high when you flip to noop or deadline and plummet on cfq. Try it. it's neat!

--
Jeff Trout <jeff@xxxxxxxxxxxxx>
http://www.stuarthamm.net/
http://www.dellsmartexitin.com/




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