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Date: Tue, 7 Dec 2004 18:11:37 -0800
From: Andrew Morton <akpm@osdl.org>
To: Andrea Arcangeli <andrea@suse.de>
Cc: nickpiggin@yahoo.com.au, axboe@suse.de, linux-kernel@vger.kernel.org
Subject: Re: Time sliced CFQ io scheduler
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Andrea Arcangeli <andrea@suse.de> wrote:
>
>  One hidden side effect of "as" is that by writing so slowly (and
>  64KiB/sec really is slow), it increases the time it will take for a
>  dirty page to be flushed to disk

The 64k/sec only happens for direct-io, and those pages aren't dirty.