Date: Wed, 17 Sep 2003 21:41:53 +0200
From: Pavel Machek <pavel@suse.cz>
To: Jens Axboe <axboe@suse.de>
Cc: Norbert Preining <preining@logic.at>, linux-kernel@vger.kernel.org
Subject: Re: laptop mode for 2.4.23-pre4 and up
Message-ID: <20030917194152.GD9125@openzaurus.ucw.cz>
References: <20030913103014.GA7535@gamma.logic.tuwien.ac.at> <20030914152755.GA27105@suse.de> <20030915093221.GE2268@gamma.logic.tuwien.ac.at> <20030917075432.GG906@suse.de>
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Hi!

> +So what does the laptop mode patch do? It attempts to fully utilize the
> +hard drive once it has been spun up, flushing the old dirty data out to
> +disk. Instead of flushing just the expired data, it will clean everything.
> +When a read causes the disk to spin up, we kick off this flushing after
> +a few seconds. This means that once the disk spins down again, everything
> +is up to date. That allows longer dirty data and journal expire times.

Another nice touch would be to sync just before spinning down.
noflushd does that... of course it needs software-controlled
spindowns.

-- 
				Pavel
Written on sharp zaurus, because my Velo1 broke. If you have Velo you don't need...

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