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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


      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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