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Message-ID: <39FDED75.EE396ED3@mandrakesoft.com>
Date: Mon, 30 Oct 2000 16:51:49 -0500
From: Jeff Garzik <jgarzik@mandrakesoft.com>
Organization: MandrakeSoft
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To: Christoph Hellwig <hch@caldera.de>
CC: Linus Torvalds <torvalds@transmeta.com>, linux-kernel@vger.kernel.org,
        sct@redhat.com
Subject: Re: [PATCH] kiobuf/rawio fixes for 2.4.0-test10-pre6
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Christoph Hellwig wrote:
> 
> On Mon, Oct 30, 2000 at 03:08:31PM -0500, Jeff Garzik wrote:
> > Actually, I wonder if its even possible for mmap_kiobuf to support audio
> > -- full duplex requires that both record and playback buffer(s),
> > theoretically two separate sets of kiobufs, to be presented as one space
> > (with playback always presented before record).
> 
> kvmaps take kiovecs, which are multiple kiobufs ...

s/sets of kiobufs/kiovecs/ in my message and re-read :)

<thinks>  Ok kiobuf mmap in OSS audio is possible, but at that point
using kiobufs is still 100% overhead, because you still have to allocate
and manage DMA buffers separately due to read(2) and write(2).

-- 
Jeff Garzik             | "Mind if I drive?"  -Sam
Building 1024           | "Not if you don't mind me clawing at the
MandrakeSoft            |  dash and shrieking like a cheerleader."
                        |                     -Max
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