From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaehoon Chung Subject: Re: [[v4] 2/5] MMC: Use CMD23 for multiblock transfers when we can. Date: Fri, 20 May 2011 13:38:29 +0900 Message-ID: <4DD5F045.90001@samsung.com> 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 Content-Transfer-Encoding: 7BIT Return-path: Received: from mailout1.samsung.com ([203.254.224.24]:17594 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935208Ab1ETEie (ORCPT ); Fri, 20 May 2011 00:38:34 -0400 Received: from epcpsbgm1.samsung.com (mailout1.samsung.com [203.254.224.24]) by mailout1.samsung.com (Oracle Communications Messaging Exchange Server 7u4-19.01 64bit (built Sep 7 2010)) with ESMTP id <0LLH00A7G8TF01M0@mailout1.samsung.com> for linux-mmc@vger.kernel.org; Fri, 20 May 2011 13:38:32 +0900 (KST) Received: from TNRNDGASPAPP1.tn.corp.samsungelectronics.net ([165.213.149.150]) by mmp1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LLH00EJX8W8SJ@mmp1.samsung.com> for linux-mmc@vger.kernel.org; Fri, 20 May 2011 13:38:32 +0900 (KST) In-reply-to: Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Andrei Warkentin Cc: Jaehoon Chung , linux-mmc@vger.kernel.org, arindam.nath@amd.com, cjb@laptop.org, arnd@arndb.de, Kyungmin Park Hi Andrei, Andrei Warkentin wrote: > 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. Can you tell me your environment? buswidth, AP information, benchmark etc.. And if you have the performance result's data, can you share them? Regards, Jaehoon Chung