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Subject: Re: scsi vs ide performance on fsync's
To: andre@linux-ide.org (Andre Hedrick)
Date: Tue, 6 Mar 2001 12:09:33 +0000 (GMT)
Cc: torvalds@transmeta.com (Linus Torvalds),
        dougg@torque.net (Douglas Gilbert), linux-kernel@vger.kernel.org
In-Reply-To: <Pine.LNX.4.10.10103052310080.13719-100000@master.linux-ide.org> from "Andre Hedrick" at Mar 05, 2001 11:12:05 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> > I don't know if there is any way to turn of a write buffer on an IDE disk.
> You want a forced set of commands to kill caching at init?

Wrong model

You want a write barrier. Write buffering (at least for short intervals) in
the drive is very sensible. The kernel needs to able to send drivers a write
barrier which will not be completed with outstanding commands before the
barrier.

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