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To: Jeff Garzik <jgarzik@pobox.com>
Cc: Bill Davidsen <davidsen@tmr.com>,
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Subject: Re: [PATCH] Intel x86-64 support merge
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From: Jes Sorensen <jes@wildopensource.com>
Date: 20 Feb 2004 02:48:06 -0500
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>>>>> "Jeff" == Jeff Garzik <jgarzik@pobox.com> writes:

Jeff> Bill Davidsen wrote:
>> Doesn't need it? Does that mean the Win64 uses bounce buffers for
>> everything? Or am I totally misreading this?

Jeff> Well, for 32-bit PCI hardware on a 64-bit OS, you pretty much
Jeff> have to bounce, without an IOMMU.

Jeff> I doubt Win64 bounces for 64-bit PCI hardware, but who knows...

Just a shame they don't seem to care about performance and allowing
one to issue SAC cycles when possible. Oh well, guess one just has to
buy a real computer.

Cheers,
Jes