From: David Newall <davidn@davidnewall.com>
To: Martin Lucina <mato@kotelna.sk>
Cc: linux-kernel@vger.kernel.org, Martin Sustrik <sustrik@fastmq.com>
Subject: Re: Higher than expected disk write(2) latency
Date: Sun, 29 Jun 2008 00:17:29 +0930 [thread overview]
Message-ID: <48664F01.7060902@davidnewall.com> (raw)
In-Reply-To: <20080628121131.GA14181@nodbug.moloch.sk>
Martin Lucina wrote:
> Measurement of the write(2) time is performed using the TSC, so any
> latency there is negligible.
Measuring each write is lavish and bound to impact the results. To
measure sustained throughput, get the time only at start and end, and
divide the difference by the number of writes.
next prev parent reply other threads:[~2008-06-28 14:47 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-28 12:11 Higher than expected disk write(2) latency Martin Lucina
2008-06-28 13:11 ` Roger Heflin
2008-06-30 18:10 ` Martin Sustrik
2008-06-30 19:02 ` Roger Heflin
2008-06-30 22:20 ` Martin Sustrik
2008-07-01 0:11 ` Bernd Eckenfels
2008-07-02 16:48 ` Martin Sustrik
2008-07-02 18:15 ` Jeff Moyer
2008-07-02 18:20 ` Martin Sustrik
2008-07-04 3:16 ` David Dillow
2008-07-02 21:33 ` Roger Heflin
2008-06-28 14:47 ` David Newall [this message]
2008-06-29 11:34 ` Martin Sustrik
2008-07-10 5:27 ` Andrew Morton
2008-07-10 8:12 ` Martin Sustrik
2008-07-10 8:14 ` Andrew Morton
2008-07-10 13:29 ` Chris Mason
2008-07-10 13:41 ` Martin Lucina
2008-07-10 14:01 ` Arjan van de Ven
2008-07-10 14:18 ` Chris Mason
2008-07-10 8:31 ` Alan Cox
2008-07-10 13:17 ` Martin Sustrik
2008-07-10 13:18 ` Andrew Morton
2008-07-11 15:17 ` Martin Sustrik
[not found] <fa.OZMA74BZPX46rhnjz1am4hB786M@ifi.uio.no>
2008-06-30 6:41 ` Robert Hancock
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