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, - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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. - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html