Date: Mon, 28 May 2007 20:22:54 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Benny Amorsen <benny+usenet@amorsen.dk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.21.1 - 97% wait time on IDE operations
Message-ID: <20070528202254.67eabe73@the-village.bc.nu>
In-Reply-To: <m31wh18eel.fsf@ursa.amorsen.dk>
References: <200705261505.38109@gj-laptop>
	<200705261746.01568@gj-laptop>
	<2c0942db0705260907g4e37d4avcc652d2b7368edd5@mail.gmail.com>
	<200705271222.30169@gj-laptop>
	<20070527130228.3731ff4d@the-village.bc.nu>
	<m31wh18eel.fsf@ursa.amorsen.dk>
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O> That's a big if right there. For servers it isn't a problem, few
> people can get capacity right to withing 10%, so you never let a
> server run full. Desktops/laptops on the other hand spend most of
> their lives between 80% and 100%.

Modern desktop patterns are very different to older ones - the disk fill
is almost entirely continuous writes of large files (OGG, MP3, Movies
etc). In addition the default ext3 behaviour reserves the last part of
the disk for root - so usually it doesn't get below 5% free as only root
can steal that space.

Back when you had a 40MB /home the usage tended to be multiple parallel
writers, permanently at 90%+ (with a "please remove unused files" motd).

Alan
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