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
Date: Thu, 18 Sep 2003 15:00:08 +0200 [thread overview]
Message-ID: <20030918130008.GG21870@suse.de> (raw)
In-Reply-To: <20030917194152.GD9125@openzaurus.ucw.cz>
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
next prev parent reply other threads:[~2003-09-18 13:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-13 10:30 laptop mode for 2.4.23-pre4 and up Norbert Preining
2003-09-14 15:27 ` Jens Axboe
2003-09-15 9:32 ` Norbert Preining
2003-09-17 7:54 ` Jens Axboe
2003-09-17 11:43 ` Norbert Preining
2003-09-17 19:41 ` Pavel Machek
2003-09-18 13:00 ` Jens Axboe [this message]
2003-09-17 20:34 ` Peter Chubb
2003-09-18 7:30 ` Jens Axboe
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