On Wed, Apr 15, 2009 at 9:19 PM, Pasi Kärkkäinen <pa...@iki.fi> wrote:
> noop is usually good for the initiator. cfq has a feature (or a bug?) that
> prevents achieving queue depths deeper than 1, and thus limits your
> bandwidth a lot when there are (or should be) many ios on the fly at the
> same time.

Do you remember on which kernel version you observed the above
behavior ? This might be a bug in the CFQ scheduler. I found the
following in the 2.6.28 changelog: "cfq-iosched: fix queue depth
detection". See also
http://www.eu.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28 or


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