From: Mark Lord <liml@rtr.ca>
To: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: "Oliver.Korpilla@gmx.de" <Oliver.Korpilla@gmx.de>,
kiu <kiu@gmx.net>,
linux-ide@vger.kernel.org
Subject: Re: kernel history of ide performance
Date: Wed, 13 Apr 2005 14:57:53 -0400 [thread overview]
Message-ID: <425D6BB1.1040904@rtr.ca> (raw)
In-Reply-To: <58cb370e050405021470f3a851@mail.gmail.com>
Note that hdparm has a "--direct" flag to perform O_DIRECT I/O,
which can sometimes give different information than the default method.
But the one weakness with 'hdparm -t' in either case,
is that it performs a single READ at a time, rather than
queuing up a pipeline full of READs. So it should always
slightly under report achievable throughput.
Cheers
prev parent reply other threads:[~2005-04-13 18:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-05 8:46 kernel history of ide performance kiu
2005-04-05 9:00 ` Bartlomiej Zolnierkiewicz
2005-04-05 9:02 ` Oliver.Korpilla
2005-04-05 9:14 ` Bartlomiej Zolnierkiewicz
2005-04-05 9:34 ` kiu
2005-04-13 18:57 ` Mark Lord [this message]
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