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 01:30:08 -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 exprod5og105.obsmtp.com ([64.18.0.180]:33181 "EHLO exprod5og105.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750704Ab1DUGaL convert rfc822-to-8bit (ORCPT ); Thu, 21 Apr 2011 02:30:11 -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 p3L6SEiP018965 for ; Thu, 21 Apr 2011 02:28:14 -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 p3L6E9n8013884 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=OK) for ; Thu, 21 Apr 2011 02:28:13 -0400 (EDT) Received: by mail-wy0-f170.google.com with SMTP id 34so1736145wyb.15 for ; Wed, 20 Apr 2011 23:30:09 -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 On Thu, Apr 21, 2011 at 1:29 AM, Andrei Warkentin wrote: > 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 sup= port >>> patch set. >>> >>> Changes: >>> 1) CMD23 support (used for features such as reliable writes) is dec= oupled >>> =A0 =A0from general multiblock trans through use of a quirk for aff= ected 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 l= ike 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. > And you're trying this on SDHCI I presume, right? A