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Re: [Qemu-devel] [PATCH 6/6] ide: Avoid canceling IDE DMA

From: Christoph Hellwig
Subject: Re: [Qemu-devel] [PATCH 6/6] ide: Avoid canceling IDE DMA
Date: Fri, 18 Mar 2011 12:19:41 +0100
User-agent: Mutt/1.5.17 (2007-11-01)

On Tue, Aug 03, 2010 at 04:44:30PM +0200, Kevin Wolf wrote:
> Furthermore because the DMA operation is splitted into many synchronous
> aio_read/write if there's more than one entry in the SG table, without this
> patch the DMA would be cancelled in the middle, something we've no idea if it
> happens on real hardware too or not. Overall this seems a great risk for zero
> gain.

That hasn't been true for a long time when this code was commited, at least
on kernel supporting preadv/pwritev and/or aio.

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