From mboxrd@z Thu Jan 1 00:00:00 1970 From: Saugata Das Subject: Re: [RFC] MMC-4.5 Context ID Date: Mon, 6 Feb 2012 11:04:10 +0530 Message-ID: References: <1328110021-15199-1-git-send-email-saugata.das@stericsson.com> <4F2F649E.2010106@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-wi0-f174.google.com ([209.85.212.174]:37825 "EHLO mail-wi0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750717Ab2BFFeL convert rfc822-to-8bit (ORCPT ); Mon, 6 Feb 2012 00:34:11 -0500 Received: by wics10 with SMTP id s10so3908860wic.19 for ; Sun, 05 Feb 2012 21:34:10 -0800 (PST) In-Reply-To: <4F2F649E.2010106@samsung.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Jaehoon Chung Cc: Chris Ball , Saugata Das , linux-mmc@vger.kernel.org On 6 February 2012 10:56, Jaehoon Chung wrote: > On 02/06/2012 02:13 PM, Saugata Das wrote: > >> On 5 February 2012 08:15, Chris Ball wrote: >>> Hi, >>> >>> On Wed, Feb 01 2012, Saugata Das wrote: >>>> From: Saugata Das >>>> >>>> This patch groups the read or write transfers to eMMC in different= contexts >>>> based on the block number. Transfers to consecutive blocks are gro= uped to a >>>> common context. So several small transfers combine to give perform= ance like >>>> a large multi block transfer. >>>> >>>> The patch creates a context of 1MB multiple in non-large unit mode= =2E Reliable >>>> mode is enabled in the context based on whether reliable write is = enabled. >>> >>> Do you see any performance changes with this patchset? =A0If so, ca= n you >>> give details? >> >> I do not see any performance impact (positive or negative) on the >> sample eMMC-4.5 device which I have. This could be due to the slow >> bridge which I use (1-bit mode at 25MHz) to connect the eMMC-4.5 >> device on micro-SD slot of 8500 platform. > > I think that should be increased the performance by how we select the= context. > I also didn't see any performance benefit..8-bit mode at 50Mhz. > But i have interest for this feature > Thanks for the info. Perhaps the initial MMC-4.5 device samples do not implement this command well. Yes, this feature is good to have in the kernel. I shall wait for some more comments on the proposed implementation before submitting the patch. > Best Regards, > Jaehoon Chung > >> >>> >>> Thanks, >>> >>> - Chris. >>> -- >>> Chris Ball =A0 =A0 >>> One Laptop Per Child >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-mmc= " in >>> the body of a message to majordomo@vger.kernel.org >>> More majordomo info at =A0http://vger.kernel.org/majordomo-info.htm= l >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-mmc"= in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at =A0http://vger.kernel.org/majordomo-info.html >> > >