Re: Performance regression in IO scheduler still there

[Jeff Moyer]

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?

Cheers,
Jeff
--
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/