linux-kernel - RE: [PATCH 2.6.34] ehci-hcd: add option to enable 64-bit DMA support

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Date:	Wed, 24 Feb 2010 19:15:16 -0800
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	<tj@...nel.org>, <hancockrwd@...il.com>
CC:	<david-b@...bell.net>, <greg@...ah.com>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: RE: [PATCH 2.6.34] ehci-hcd: add option to enable 64-bit DMA support

> (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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