From: G廨ard 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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