Date: Thu, 18 Sep 2003 15:00:08 +0200
From: Jens Axboe <axboe@suse.de>
To: Pavel Machek <pavel@suse.cz>
Cc: Norbert Preining <preining@logic.at>, linux-kernel@vger.kernel.org
Subject: Re: laptop mode for 2.4.23-pre4 and up
Message-ID: <20030918130008.GG21870@suse.de>
References: <20030913103014.GA7535@gamma.logic.tuwien.ac.at> <20030914152755.GA27105@suse.de> <20030915093221.GE2268@gamma.logic.tuwien.ac.at> <20030917075432.GG906@suse.de> <20030917194152.GD9125@openzaurus.ucw.cz>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20030917194152.GD9125@openzaurus.ucw.cz>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1093
Lines: 26

On Wed, Sep 17 2003, Pavel Machek wrote:
> 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.

Yeah, my automatic acoustic management patch did that, works well in
addition to laptop mode. It's beyond the scope of this patch though,
it's just a vm flushing control.

-- 
Jens Axboe

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/