From: Nick Piggin <piggin@cyberone.com.au>
To: John Bradford <john@grabjohn.com>
Cc: cfriesen@nortelnetworks.com, 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, 01 Apr 2003 08:58:32 +1000 [thread overview]
Message-ID: <3E88C818.1040506@cyberone.com.au> (raw)
In-Reply-To: <200303312251.h2VMp8gv000270@81-2-122-30.bradfords.org.uk>
John Bradford wrote:
>>If the memory does get written to again before the writeout timeout
>>then yeah its used some cpu, memory, pci, etc that it didn't have
>>to.
>>
>
>It will presumably also have filled the cache with the writeout data.
>
What cache?
>
>
>>>Ultimately its all a tradeoff. Do you write now, or do you hold off
>>>and hope that you can throw away some of the writes because new stuff
>>>will home in to overwrite them?
>>>
>>Yes it is a tradeoff. Having an idle disk gives more weight to "write now".
>>
>
>Not necessarily. What if you are using a solid state disk which only
>allows a relatively low number of re-write cycles? What if the disk
>is spun down, and spinning it up uses a lot of power? On a laptop,
>you don't necessarily want the disk spinning up just to write one
>sector.
>
Yes it does. The factors you mention just add (a lot) more
weight to "hold off".
next prev parent reply other threads:[~2003-03-31 22:47 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 [this message]
2003-03-31 22:45 ` Andrew Morton
2003-03-31 23:03 ` Nick Piggin
2003-03-31 23:32 ` Ingo Oeser
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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