linux-kernel - Re: [PATCH v9 00/12] use nonblock mmc requests to minimize latency

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Message-ID: <m2y607jec6.fsf@bob.laptop.org>
Date:	Sat, 09 Jul 2011 18:09:45 -0400
From:	Chris Ball <cjb@...top.org>
To:	Per Forlin <per.forlin@...aro.org>
Cc:	linaro-dev@...ts.linaro.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, "S\, Venkatraman" <svenkatr@...com>
Subject: Re: [PATCH v9 00/12] use nonblock mmc requests to minimize latency

Hi Per,

On Fri, Jul 01 2011, Per Forlin wrote:
> How significant is the cache maintenance over head?
> It depends, the eMMC are much faster now
> compared to a few years ago and cache maintenance cost more due to
> multiple cache levels and speculative cache pre-fetch. In relation the
> cost for handling the caches have increased and is now a bottle neck
> dealing with fast eMMC together with DMA.

Thanks very much, I've pushed v9 of the patchset to mmc-next for 3.1
(after fixing some merge conflicts against Adrian Hunter's recent patches
and rewording some of the commit message texts).

- Chris.
-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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