From: Jens Axboe <jens.axboe@oracle.com>
To: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: fio <fio@vger.kernel.org>
Subject: Re: fio mmap writes much slower than default writes
Date: Sat, 18 Jul 2009 16:39:55 +0200 [thread overview]
Message-ID: <20090718143955.GJ4148@kernel.dk> (raw)
In-Reply-To: <1247925507.2712.11.camel@localhost.localdomain>
On Sat, Jul 18 2009, Richard Kennedy wrote:
> Disk stats (read/write):
> dm-0: ios=3571/9894, merge=0/0, ticks=25884/31650, in_queue=511733, util=96.46%, aggrios=0/0, aggrmerge=0/0, aggrticks=0/0, aggrin_queue=0, aggrutil=0.00%
If you look at the disk stats, it also shows a considerable amount of
reads. So I'm guessing that you need pre_read=1 to get the same sort of
results.
--
Jens Axboe
next prev parent reply other threads:[~2009-07-18 14:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-16 13:40 fio mmap writes much slower than default writes Richard Kennedy
2009-07-18 6:18 ` Jens Axboe
2009-07-18 13:58 ` Richard Kennedy
2009-07-18 14:20 ` Jens Axboe
2009-07-18 14:39 ` Jens Axboe [this message]
2009-07-18 14:50 ` Richard Kennedy
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