Re: Performance regression in IO scheduler still there
From: Jeff Moyer
Date: Fri Nov 06 2009 - 09:15:24 EST
Corrado Zoccolo <czoccolo@xxxxxxxxx> 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?
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/