From: "Alan D. Brunelle" <Alan.Brunelle@hp.com>
To: linux-kernel@vger.kernel.org
Cc: Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [PATCH 0/15] CFQ IO scheduler patch series
Date: Wed, 25 Apr 2007 10:42:07 -0400 [thread overview]
Message-ID: <462F68BF.5000805@hp.com> (raw)
In-Reply-To: <11774025432481-git-send-email-jens.axboe@oracle.com>
Using the patches posted yesterday
(http://marc.info/?l=linux-kernel&m=117740312628325&w=2) here are some
quick read results (as measured by iostat over a 5 minute period, taken
in 6 second intervals) on a 4-way IA64 box with 42 disks (24 FC and 18
U320), 42 processes (1 per disk) with 256 AIOs (16KB) outstanding at all
times per device:
2.6.21-rc7: 1,006.023 MB/second
2.6.21-rc7 + new CFQ IO scheduler: 1,030.767 MB/second
showing about a 2.46% performance improvement with a 2.43% increase in
%system used (3.738% -> 3.829%).
Interestingly enough this patch also seems to remove some noise during
the run - see the chart at http://free.linux.hp.com/~adb/cfq/rkb_s.png
Alan D. Brunelle
HP / Open Source and Linux Organization / Scalability and Performance Group
prev parent reply other threads:[~2007-04-25 14:56 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-24 8:15 [PATCH 0/15] CFQ IO scheduler patch series Jens Axboe
2007-04-24 8:15 ` [PATCH 1/15] cfq-iosched: improve preemption for cooperating tasks Jens Axboe
2007-04-24 8:15 ` [PATCH 2/15] cfq-iosched: development update Jens Axboe
2007-04-24 8:15 ` [PATCH 3/15] cfq-iosched: minor updates Jens Axboe
2007-04-24 8:15 ` [PATCH 4/15] cfq-iosched: rework the whole round-robin list concept Jens Axboe
2007-04-24 8:15 ` [PATCH 5/15] cfq-iosched: speed up rbtree handling Jens Axboe
2007-04-25 15:59 ` Alan D. Brunelle
2007-04-25 17:15 ` Jens Axboe
2007-04-25 17:50 ` Jens Axboe
2007-04-25 18:08 ` Jens Axboe
2007-04-26 14:28 ` Alan D. Brunelle
2007-04-26 15:46 ` Jens Axboe
2007-04-24 8:15 ` [PATCH 6/15] cfq-iosched: sort RT queues into the rbtree Jens Axboe
2007-04-24 8:15 ` [PATCH 7/15] cfq-iosched: sort IDLE " Jens Axboe
2007-04-24 8:15 ` [PATCH 8/15] cfq-iosched: style cleanups and comments Jens Axboe
2007-04-24 8:15 ` [PATCH 9/15] cfq-iosched: slice offset should take ioprio into account Jens Axboe
2007-04-24 8:15 ` [PATCH 10/15] cfq-iosched: get rid of ->cur_rr and ->cfq_list Jens Axboe
2007-04-24 8:15 ` [PATCH 11/15] cfq-iosched: don't pass unused preemption variable around Jens Axboe
2007-04-24 8:15 ` [PATCH 12/15] cfq-iosched: get rid of ->dispatch_slice Jens Axboe
2007-04-24 8:15 ` [PATCH 13/15] cfq-iosched: never allow an async queue idling Jens Axboe
2007-04-24 8:15 ` [PATCH 14/15] cfq-iosched: improve sync vs async workloads Jens Axboe
2007-04-24 8:15 ` [PATCH 15/15] cfq-iosched: tighten queue request overlap condition Jens Axboe
2007-04-25 14:42 ` Alan D. Brunelle [this message]
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