From: Ingo Oeser <ingo.oeser@informatik.tu-chemnitz.de>
To: Andrew Morton <akpm@digeo.com>
Cc: Nick Piggin <piggin@cyberone.com.au>,
helgehaf@aitel.hist.no, erik@hensema.net,
linux-kernel@vger.kernel.org
Subject: Re: Delaying writes to disk when there's no need
Date: Tue, 1 Apr 2003 01:32:58 +0200 [thread overview]
Message-ID: <20030401013258.G626@nightmaster.csn.tu-chemnitz.de> (raw)
In-Reply-To: <20030331144500.17bf3a2e.akpm@digeo.com>; from akpm@digeo.com on Mon, Mar 31, 2003 at 02:45:00PM -0800
On Mon, Mar 31, 2003 at 02:45:00PM -0800, Andrew Morton wrote:
> It could have pretty bad failure modes. Short-lived files in /tmp now
> perform writeout, which needs to be waited on when those files are removed.
/tmp is not a problem, because this can be fixed by using tmpfs
(I use 2GB of it with 1GB of RAM).
Bad are the small writes generated by the proposed behavior.
The disk is idle, so this is not about performance, but power
consumption. Spinning up a disk costs around 1-2 seconds, so you
should come in with at least the amount of data you write in 1-2
seconds for a spun down disk.
Regards
Ingo Oeser
--
Marketing ist die Kunst, Leuten Sachen zu verkaufen, die sie
nicht brauchen, mit Geld, was sie nicht haben, um Leute zu
beeindrucken, die sie nicht moegen.
next prev parent reply other threads:[~2003-03-31 23:29 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-26 20:31 Delaying writes to disk when there's no need Erik Hensema
2003-03-27 9:06 ` Helge Hafting
2003-03-27 11:22 ` Erik Hensema
2003-03-28 23:12 ` Pavel Machek
2003-03-31 12:00 ` Erik Hensema
2003-03-31 13:42 ` Helge Hafting
2003-03-31 14:45 ` Oliver Neukum
2003-03-31 22:02 ` Nick Piggin
2003-03-31 22:22 ` Chris Friesen
2003-03-31 22:35 ` Nick Piggin
2003-03-31 22:51 ` John Bradford
2003-03-31 22:58 ` Nick Piggin
2003-03-31 22:45 ` Andrew Morton
2003-03-31 23:03 ` Nick Piggin
2003-03-31 23:32 ` Ingo Oeser [this message]
2003-04-01 0:02 ` Andrew Morton
2003-04-01 0:43 ` Daniel Pittman
2003-04-01 1:09 ` Andrew Morton
2003-04-01 1:34 ` Daniel Pittman
2003-04-01 1:45 ` Andrew Morton
[not found] ` <3E88EB3D.6020409@cyberone.com.au>
2003-04-01 1:39 ` Andrew Morton
[not found] <20030326204012$188c@gated-at.bofh.it>
[not found] ` <20030327091007$22a5@gated-at.bofh.it>
[not found] ` <20030327113014$37b4@gated-at.bofh.it>
2003-03-28 10:18 ` Tim Connors
2003-03-30 17:38 ` Helge Hafting
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