Re: With Daniel Phillips Patch

David S. Miller
2001-08-22T21:15:25Z

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From: Gérard Roudier <groudier@free.fr>
Date: Wed, 22 Aug 2001 23:07:47 +0200 (CEST)

And I seem to understand that David's preferred SUN hardware only
allows streaming when using SAC with IOMMU.:-)

It is true.

And using DAC is 1 PCI cycle lost per transaction and if we are
picky on performances ...

True. This is why I find it mysterious when I run across a device
which does not issue SAC for addresses with only 32-bits of
significance.

Happily, most do behave this way.

Later,
David S. Miller
davem@redhat.com
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