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Subject: Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait
To: torvalds@transmeta.com (Linus Torvalds)
Date: Mon, 5 Feb 2001 17:27:12 +0000 (GMT)
Cc: manfred@colorfullife.com (Manfred Spraul),
        sct@redhat.com (Stephen C. Tweedie),
        hch@caldera.de (Christoph Hellwig), lord@sgi.com (Steve Lord),
        linux-kernel@vger.kernel.org, kiobuf-io-devel@lists.sourceforge.net,
        alan@lxorguk.ukuu.org.uk (Alan Cox)
In-Reply-To: <Pine.LNX.4.10.10102050851030.30798-100000@penguin.transmeta.com> from "Linus Torvalds" at Feb 05, 2001 08:56:34 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> In fact, regular IDE DMA allows arbitrary scatter-gather at least in
> theory. Linux has never used it, so I don't know how well it works in

Purely in theory, as Jeff found out. 

> But despite a lot of likely practical reasons why it won't work for
> arbitrary sg lists on plain IDE DMA, there is no _theoretical_ reason it
> wouldn't. And there are bound to be better controllers that could handle
> it.

I2O controllers are required too handle it (most dont) and some of the high
end scsi/fc controllers even get it right


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