On Thu, 13 Dec 2007, Louis-David Mitterrand wrote:

Hi,

after reading some interesting suggestions on kernel tuning at:

	http://hep.kbfi.ee/index.php/IT/KernelTuning

I am wondering whether 'deadline' is indeed the best IO scheduler (vs.
anticipatory and cfq) for a soft raid5/6 partition on a server?

What is the common wisdom on the subject among linux-raid users and
developers?

Thanks,
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I have found anticipatory to be the fastest.

http://home.comcast.net/~jpiszcz/sched/cfq_vs_as_vs_deadline_vs_noop.html

Sequential:
Output of CFQ: (horrid): 311,683 KiB/s
  Output of AS: 443,103 KiB/s

Input CFQ is a little faster.

It depends on your workload I suppose.

Justin.