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

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Message-ID: <4B8609CE.5000705@kernel.org>
Date:	Thu, 25 Feb 2010 14:25:34 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Oliver Neukum <oliver@...kum.org>
CC:	Yuhong Bao <yuhongbao_386@...mail.com>, hancockrwd@...il.com,
	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

On 02/25/2010 01:03 PM, Oliver Neukum wrote:
> Am Donnerstag, 25. Februar 2010 04:29:12 schrieb Tejun Heo:
>> 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.
> 
> That can and should be tested.

Robert did already.  Given that USB2.0 devices aren't usually used for
high-perf storage subsystem, the benefit looks marginal to me but
everyone is entitled to own opinion.

Thanks.

Thanks.

-- 
tejun
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