From: Tejun Heo <tj@kernel.org>
To: Yuhong Bao <yuhongbao_386@hotmail.com>
Cc: hancockrwd@gmail.com, david-b@pacbell.net, greg@kroah.com,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [PATCH 2.6.34] ehci-hcd: add option to enable 64-bit DMA support
Date: Thu, 25 Feb 2010 12:29:12 +0900 [thread overview]
Message-ID: <4B85EE88.5050506@kernel.org> (raw)
In-Reply-To: <SNT125-W36AFF0BF953EABAC9A0432C3400@phx.gbl>
Hello,
On 02/25/2010 12:15 PM, Yuhong Bao wrote:
>> (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.
Arghhh.... I hate when intel pulls this type of 'product
differentiation' stunts. At any rate, I'm doubtful swiotlb'ing for
usb2.0 would be noticeable at all.
Thanks.
--
tejun
next prev parent reply other threads:[~2010-02-25 3:19 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-18 3:10 [PATCH 2.6.34] ehci-hcd: add option to enable 64-bit DMA support Robert Hancock
2010-02-18 4:26 ` Greg KH
2010-02-18 5:13 ` Robert Hancock
2010-02-18 5:22 ` Greg KH
2010-02-19 0:33 ` Robert Hancock
2010-02-19 0:47 ` Greg KH
2010-02-19 3:46 ` Robert Hancock
2010-02-19 3:54 ` Greg KH
2010-02-20 1:30 ` Robert Hancock
2010-02-20 4:26 ` Greg KH
2010-02-20 5:39 ` David Brownell
2010-02-20 7:15 ` Robert Hancock
2010-02-20 8:07 ` David Brownell
2010-02-20 18:13 ` Robert Hancock
2010-02-23 6:48 ` Yuhong Bao
2010-02-24 0:26 ` Robert Hancock
2010-02-25 2:28 ` Tejun Heo
2010-02-25 2:41 ` Yuhong Bao
2010-02-25 2:58 ` Tejun Heo
2010-02-25 3:15 ` Yuhong Bao
2010-02-25 3:29 ` Tejun Heo [this message]
2010-02-25 4:03 ` Oliver Neukum
2010-02-25 5:25 ` Tejun Heo
2010-02-25 16:14 ` Greg KH
2010-02-25 23:15 ` Robert Hancock
2010-02-25 23:25 ` Greg KH
2010-02-26 7:01 ` Oliver Neukum
2010-02-24 3:53 ` SB600 64-bit DMA BIOS misconfiguration (formerly RE: [PATCH 2.6.34] ehci-hcd: add option to enable 64-bit DMA support) Yuhong Bao
2010-02-24 4:30 ` Robert Hancock
2010-02-24 4:33 ` Yuhong Bao
2010-02-24 13:30 ` Huang, Shane
2010-02-23 6:28 ` [PATCH 2.6.34] ehci-hcd: add option to enable 64-bit DMA support Yuhong Bao
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4B85EE88.5050506@kernel.org \
--to=tj@kernel.org \
--cc=david-b@pacbell.net \
--cc=greg@kroah.com \
--cc=hancockrwd@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=yuhongbao_386@hotmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox