Messages in this thread | | | From | Jeff Moyer <> | Subject | Re: Performance regression in IO scheduler still there | Date | Fri, 06 Nov 2009 09:14:53 -0500 |
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Corrado Zoccolo <czoccolo@gmail.com> writes:
> Hi Jeff, > what hardware are you using for tests? > I see aggregated random read bandwidth is larger than sequential read > bandwidth, and write bandwidth greater than read. > Is this a SAN with multiple independent spindles?
Yeah, this is a single path to an HP EVA storage array. There are 24 or so disks striped in the pool used to create the volume I am using. Jan, could you repeat your tests with /sys/block/sdX/queue/iosched/low_latency set to 0?
Cheers, Jeff
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