Messages in this thread | | | From | Yuhong Bao <> | Subject | RE: [PATCH 2.6.34] ehci-hcd: add option to enable 64-bit DMA support | Date | Wed, 24 Feb 2010 19:15:16 -0800 |
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> (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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