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SubjectRE: [PATCH 2.6.34] ehci-hcd: add option to enable 64-bit DMA support
Date


> (following thread from the ATA side) I'm with Greg on this. USB2.0 is
> quite slow on today's standard and most 64bit machines now have IOMMU
> of some kind anyway.

Except that unfortunately, Intel with Lynnfield and Clarkdale decided
to do market segmentation on the VT-d feature.
This could be done because both have an integrated northbridge.
With Lynnfield, the very common Core i5 750 CPU do not support VT-d,
but the Core i7 800 series does.
With Clarkdale, the very common Core i3 500 series do not support VT-d,
but the Core i5 600 series does, except the 661.
Not to mention that in the Core 2 generation, VT-d was available only
on Q35/Q45/X38/X48 chipsets.

Yuhong Bao

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