From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755458Ab3AGTkx (ORCPT ); Mon, 7 Jan 2013 14:40:53 -0500 Received: from tex.lwn.net ([70.33.254.29]:58352 "EHLO vena.lwn.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755436Ab3AGTkw (ORCPT ); Mon, 7 Jan 2013 14:40:52 -0500 Date: Mon, 7 Jan 2013 12:40:50 -0700 From: Jonathan Corbet To: Alessandro Rubini Cc: federico.vaga@gmail.com, mchehab@redhat.com, m.szyprowski@samsung.com, mchehab@infradead.org, pawel@osciak.com, hans.verkuil@cisco.com, giancarlo.asnaghi@st.com, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, s.nawrocki@samsung.com Subject: Re: [PATCH v3 2/4] videobuf2-dma-streaming: new videobuf2 memory allocator Message-ID: <20130107124050.3fc5031b@lwn.net> In-Reply-To: <20130106230947.GA17979@mail.gnudd.com> References: <3892735.vLSnhhCRFi@harkonnen> <1348484332-8106-1-git-send-email-federico.vaga@gmail.com> <1399400.izKZgEHXnP@harkonnen> <12929800.xFTBAueAE0@harkonnen> <20130106230947.GA17979@mail.gnudd.com> Organization: LWN.net X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 7 Jan 2013 00:09:47 +0100 Alessandro Rubini 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