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 http://lkml.org/lkml/2008/8/22/39. Bart. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-iscsi@googlegroups.com To unsubscribe from this group, send email to open-iscsi+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/open-iscsi -~----------~----~----~----~------~----~------~--~---
