From: Avi Kivity <avi@argo.co.il>
To: Jens Axboe <axboe@suse.de>
Cc: Mark Lord <lkml@rtr.ca>, Linus Torvalds <torvalds@osdl.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org, mason@suse.com,
andrea@suse.de, hugh@veritas.com
Subject: Re: NCQ performance (was Re: [rfc][patch] remove racy sync_page?)
Date: Thu, 01 Jun 2006 17:56:35 +0300 [thread overview]
Message-ID: <447F0023.8090206@argo.co.il> (raw)
In-Reply-To: <20060601131921.GH4400@suse.de>
Jens Axboe wrote:
>
> Ok, I decided to rerun a simple random read work load (with fio), using
> depths 1 and 32. The test is simple - it does random reads all over the
> drive size with 4kb block sizes. The reads are O_DIRECT. The test
> pattern was set to repeatable, so it's going through the same workload.
> The test spans the first 32G of the drive and runtime is capped at 20
> seconds.
>
Did you modify the iodepth given to the test program, or to the drive?
If the former, then some of the performance increase came from the Linux
elevator.
Ideally exactly the same test would be run with the just the drive
parameters changed.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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next prev parent reply other threads:[~2006-06-01 14:56 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-29 9:34 [rfc][patch] remove racy sync_page? Nick Piggin
2006-05-29 19:15 ` Andrew Morton
2006-05-30 0:08 ` Nick Piggin
2006-05-30 1:32 ` Andrew Morton
2006-05-30 2:54 ` Nick Piggin
2006-05-30 3:14 ` Andrew Morton
2006-05-30 4:13 ` Nick Piggin
2006-05-30 9:05 ` Jens Axboe
2006-05-31 13:43 ` Nick Piggin
2006-05-31 15:09 ` Hugh Dickins
2006-05-31 15:22 ` Nick Piggin
2006-05-31 17:51 ` Jens Axboe
2006-05-31 17:50 ` Jens Axboe
2006-05-30 4:20 ` Linus Torvalds
2006-05-30 5:07 ` Nick Piggin
2006-05-30 5:21 ` Nick Piggin
2006-05-30 6:12 ` Neil Brown
2006-05-30 7:10 ` Nick Piggin
2006-05-31 4:34 ` Neil Brown
2006-05-30 8:24 ` Nikita Danilov
2006-05-30 17:55 ` Linus Torvalds
2006-05-31 0:32 ` Nick Piggin
2006-05-31 0:56 ` Linus Torvalds
2006-05-31 1:33 ` Mark Lord
2006-05-31 6:11 ` Jens Axboe
2006-05-31 12:55 ` Mark Lord
2006-05-31 13:02 ` Jens Axboe
2006-06-01 13:19 ` NCQ performance (was Re: [rfc][patch] remove racy sync_page?) Jens Axboe
2006-06-01 14:56 ` Avi Kivity [this message]
2006-06-01 15:03 ` Jens Axboe
2006-06-01 18:04 ` Jens Axboe
2006-06-05 5:30 ` Avi Kivity
2006-06-05 7:59 ` Jens Axboe
2006-05-31 12:31 ` [rfc][patch] remove racy sync_page? Helge Hafting
2006-05-31 12:36 ` Arjan van de Ven
2006-05-31 13:29 ` Nick Piggin
2006-05-31 13:41 ` Jens Axboe
2006-05-31 13:54 ` Nick Piggin
2006-05-31 14:43 ` Linus Torvalds
2006-05-31 14:57 ` Nick Piggin
2006-05-31 15:13 ` Linus Torvalds
2006-05-31 15:09 ` Linus Torvalds
2006-05-31 18:13 ` Jens Axboe
2006-05-31 18:26 ` Linus Torvalds
2006-05-30 5:36 ` Nick Piggin
2006-05-30 18:31 ` Hugh Dickins
2006-05-31 0:21 ` Nick Piggin
2006-05-31 3:06 ` Hugh Dickins
2006-05-31 14:30 ` Hugh Dickins
2006-05-31 17:56 ` Jens Axboe
2006-05-30 5:51 ` Josef Sipek
2006-05-30 6:44 ` Nick Piggin
2006-05-30 6:50 ` Nick Piggin
2006-05-30 13:12 ` Josef Sipek
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