From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrei Warkentin Subject: Re: [[v4] 2/5] MMC: Use CMD23 for multiblock transfers when we can. Date: Thu, 19 May 2011 12:01:22 -0500 Message-ID: References: <1302950458-1969-1-git-send-email-andreiw@motorola.com> <1303870235-29041-1-git-send-email-andreiw@motorola.com> <1303870235-29041-2-git-send-email-andreiw@motorola.com> <1303870235-29041-3-git-send-email-andreiw@motorola.com> <4DD48273.4060402@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Return-path: Received: from exprod5og116.obsmtp.com ([64.18.0.147]:52791 "EHLO exprod5og116.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933550Ab1ESRBZ (ORCPT ); Thu, 19 May 2011 13:01:25 -0400 Received: from il93mgrg01.am.mot-mobility.com ([10.176.129.42]) by il93mgrg01.am.mot-mobility.com (8.14.3/8.14.3) with ESMTP id p4JGx4nw012545 for ; Thu, 19 May 2011 12:59:04 -0400 (EDT) Received: from mail-ww0-f46.google.com (mail-ww0-f46.google.com [74.125.82.46]) by il93mgrg01.am.mot-mobility.com (8.14.3/8.14.3) with ESMTP id p4JGwopo012396 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=OK) for ; Thu, 19 May 2011 12:59:03 -0400 (EDT) Received: by mail-ww0-f46.google.com with SMTP id 28so3061087wwb.3 for ; Thu, 19 May 2011 10:01:22 -0700 (PDT) In-Reply-To: <4DD48273.4060402@samsung.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Jaehoon Chung Cc: linux-mmc@vger.kernel.org, arindam.nath@amd.com, cjb@laptop.org, arnd@arndb.de, Kyungmin Park On Wed, May 18, 2011 at 9:37 PM, Jaehoon Chung wrote: > Hi Andrei > > Andrei Warkentin wrote: >> CMD23-prefixed instead of open-ended multiblock transfers >> have a performance advantage on some MMC cards. >> > you mentioned about "some MMC cards". > Conversely, that means the some card didn't have a performance advantage? > > Did you find the performance advantage? > if you found the advantage and you can tell me, > i want to know what do you have the some MMC cards.. > I've tested this on a Sandisk eMMC where I saw as good as a 50% improvement on writes (30% real-life use cases). This was a SEM32G 4.3+ part. A