linux-kernel - Re: [PATCH v3 2/4] videobuf2-dma-streaming: new videobuf2 memory allocator

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Message-ID: <20130107124050.3fc5031b@lwn.net>
Date:	Mon, 7 Jan 2013 12:40:50 -0700
From:	Jonathan Corbet <corbet@....net>
To:	Alessandro Rubini <rubini@...dd.com>
Cc:	federico.vaga@...il.com, mchehab@...hat.com,
	m.szyprowski@...sung.com, mchehab@...radead.org, pawel@...iak.com,
	hans.verkuil@...co.com, giancarlo.asnaghi@...com,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	s.nawrocki@...sung.com
Subject: Re: [PATCH v3 2/4] videobuf2-dma-streaming: new videobuf2 memory
 allocator

On Mon, 7 Jan 2013 00:09:47 +0100
Alessandro Rubini <rubini@...dd.com> wrote:

> I don't expect you'll see serious performance differences on the PC. I
> think ARM users will have better benefits, due to the different cache
> architecture.  You told me Jon measured meaningful figures on a Marvel
> CPU.

It made the difference between 10 frames per second with the CPU running
flat out and 30fps mostly idle.  I think that probably counts as
meaningful, yeah...:)

jon
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