From: Grard Roudier 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 :.˛mkabzwmb˛mbz_^nrzh&zzޗ++zfh~iz_j:+v)ߣmSy杶ii