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From: Pavel Machek <pavel@suse.cz>
To: John Stoffel <stoffel@casc.com>
Cc: Roger Larsson <roger.larsson@norran.net>,
	Daniel Phillips <phillips@bonn-fries.net>,
	Linux-Kernel <linux-kernel@vger.kernel.org>
Subject: spindown [was Re: 2.4.6-pre2, pre3 VM Behavior]
Date: Fri, 15 Jun 2001 15:23:07 +0000	[thread overview]
Message-ID: <20010615152306.B37@toy.ucw.cz> (raw)
In-Reply-To: <Pine.LNX.4.21.0106140013000.14934-100000@imladris.rielhome.conectiva> <01061410474103.00879@starship> <200106142030.f5EKUWH19842@maile.telia.com> <15145.8435.312548.682190@gargle.gargle.HOWL>
In-Reply-To: <15145.8435.312548.682190@gargle.gargle.HOWL>; from stoffel@casc.com on Thu, Jun 14, 2001 at 04:39:15PM -0400

Hi!

> Roger> It does if you are running on a laptop. Then you do not want
> Roger> the pages go out all the time. Disk has gone too sleep, needs
> Roger> to start to write a few pages, stays idle for a while, goes to
> Roger> sleep, a few more pages, ...
> 
> That could be handled by a metric which says if the disk is spun down,
> wait until there is more memory pressure before writing.  But if the
> disk is spinning, we don't care, you should start writing out buffers
> at some low rate to keep the pressure from rising too rapidly.  

Notice that write is not free (in terms of power) even if disk is spinning.
Seeks (etc) also take some power. And think about flashcards. It certainly
is cheaper tha spinning disk up but still not free.

Also note that kernel does not [currently] know that disks went spindown.
								Pavel
-- 
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.


  parent reply	other threads:[~2001-06-16 19:58 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-06-13 19:31 2.4.6-pre2, pre3 VM Behavior Tom Sightler
2001-06-13 20:21 ` Rik van Riel
2001-06-14  1:49   ` Tom Sightler
2001-06-14  3:16     ` Rik van Riel
2001-06-14  7:59       ` Laramie Leavitt
2001-06-14  9:24         ` Helge Hafting
2001-06-14 17:38           ` Mark Hahn
2001-06-15  8:27             ` Helge Hafting
2001-06-14  8:47       ` Daniel Phillips
2001-06-14 20:23         ` Roger Larsson
2001-06-15  6:04           ` Mike Galbraith
2001-06-14 20:39         ` John Stoffel
2001-06-14 20:51           ` Rik van Riel
2001-06-14 21:33           ` John Stoffel
2001-06-14 22:23             ` Rik van Riel
2001-06-15 15:23           ` Pavel Machek [this message]
2001-06-16 20:50             ` spindown [was Re: 2.4.6-pre2, pre3 VM Behavior] Daniel Phillips
2001-06-16 21:06               ` Rik van Riel
2001-06-16 21:25                 ` Rik van Riel
2001-06-16 21:44                 ` Daniel Phillips
2001-06-16 21:54                   ` Rik van Riel
2001-06-17 10:28                     ` Daniel Phillips
2001-06-17 10:05                   ` Mike Galbraith
2001-06-17 12:49                     ` (lkml)Re: " thunder7
2001-06-17 16:40                       ` Mike Galbraith
2001-06-18 14:22                     ` Daniel Phillips
2001-06-19  4:35                       ` Mike Galbraith
2001-06-20  1:50                       ` [RFC] Early flush (was: spindown) Daniel Phillips
2001-06-20 20:58                         ` Tom Sightler
2001-06-20 22:09                           ` Daniel Phillips
2001-06-24  3:20                           ` Anuradha Ratnaweera
2001-06-24 11:14                             ` Daniel Phillips
2001-06-24 15:06                             ` Rik van Riel
2001-06-24 16:21                               ` Daniel Phillips
2001-06-20  4:39                       ` Richard Gooch
2001-06-20 14:29                         ` Daniel Phillips
2001-06-20 16:12                         ` Richard Gooch
2001-06-22 23:25                           ` Daniel Kobras
2001-06-23  5:10                             ` Daniel Phillips
2001-06-25 11:33                               ` Pavel Machek
2001-06-25 11:31                           ` Pavel Machek
2001-06-18 20:21             ` spindown Simon Huggins
2001-06-19 10:46               ` spindown Pavel Machek
2001-06-20 16:52                 ` spindown Daniel Phillips
2001-06-20 17:32                   ` spindown Rik van Riel
2001-06-20 18:00                     ` spindown Daniel Phillips
2001-06-21 16:07                 ` spindown Jamie Lokier
2001-06-22 22:09                   ` spindown Daniel Kobras
2001-06-28  0:27                   ` spindown Troy Benjegerdes
2001-06-14 15:10       ` 2.4.6-pre2, pre3 VM Behavior John Stoffel
2001-06-14 18:25         ` Daniel Phillips
2001-06-14  8:30   ` Mike Galbraith

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