Messages in this thread | | | Date | Tue, 10 Nov 2009 19:37:30 +0100 | From | Jan Kara <> | Subject | Re: Performance regression in IO scheduler still there |
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On Fri 06-11-09 09:14:53, Jeff Moyer wrote: > 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? I'll give it a spin tomorrow...
Honza -- Jan Kara <jack@suse.cz> SUSE Labs, CR
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