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Message-ID: <SNT125-W36AFF0BF953EABAC9A0432C3400@phx.gbl> 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 _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. http://clk.atdmt.com/GBL/go/201469227/direct/01/-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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