From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrei Warkentin Subject: Re: CMD23 plumbing and support patchset. Date: Thu, 21 Apr 2011 01:29:40 -0500 Message-ID: References: <1302741523-22276-1-git-send-email-andreiw@motorola.com> <1302950458-1969-1-git-send-email-andreiw@motorola.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from exprod5og103.obsmtp.com ([64.18.0.145]:55551 "EHLO exprod5og103.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752309Ab1DUG3n convert rfc822-to-8bit (ORCPT ); Thu, 21 Apr 2011 02:29:43 -0400 Received: from il93mgrg01.am.mot-mobility.com ([10.22.94.168]) by il93mgrg01.am.mot-mobility.com (8.14.3/8.14.3) with ESMTP id p3L6RkqO018787 for ; Thu, 21 Apr 2011 02:27:46 -0400 (EDT) Received: from mail-wy0-f170.google.com (mail-wy0-f170.google.com [74.125.82.170]) by il93mgrg01.am.mot-mobility.com (8.14.3/8.14.3) with ESMTP id p3L6NP6N017238 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=OK) for ; Thu, 21 Apr 2011 02:27:45 -0400 (EDT) Received: by mail-wy0-f170.google.com with SMTP id 34so1742494wyb.15 for ; Wed, 20 Apr 2011 23:29:41 -0700 (PDT) In-Reply-To: Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Chris Ball Cc: linux-mmc@vger.kernel.org, arindam.nath@amd.com Hi Chris, On Wed, Apr 20, 2011 at 8:44 PM, Chris Ball wrote: > Hi, > > On Sat, Apr 16 2011, Andrei Warkentin wrote: >> This is the third version of the CMD23 plumbing and host driver supp= ort >> patch set. >> >> Changes: >> 1) CMD23 support (used for features such as reliable writes) is deco= upled >> =A0 =A0from general multiblock trans through use of a quirk for affe= cted cards. >> 2) Newer Sandisk MMC products are whitelisted along with some known = good ones. All other >> =A0 =A0MMC products do not use CMD23 for general transfers (seems li= ke safest choice for now). >> =A0 =A0SD products unaffected. > > Just gave this a try on SEM04G, which is in the whitelist, but didn't > see a performance increase (or decrease). =A0What are you using for a > testcase? =A0I'm a little wary of running mmc_test on it. =A0:) > Can you give me the manufacturing date? This is pretty interesting. You can see an improvement even if you do something like time block writes (O_DIRECT | O_SYNC, of course). But after all synthetic tests I measured the time it took to do 40000 SQLite insertions and saw something like 30% improvement. A