From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Ball Subject: Re: [PATCH] mmc: sdio: To use multiple scatter gather list Date: Mon, 29 Oct 2012 17:20:36 -0400 Message-ID: <87d301q8kb.fsf@octavius.laptop.org> References: <001101cdb044$8565abf0$903103d0$%kim@samsung.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from void.printf.net ([89.145.121.20]:35423 "EHLO void.printf.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760988Ab2J2VUl (ORCPT ); Mon, 29 Oct 2012 17:20:41 -0400 In-Reply-To: <001101cdb044$8565abf0$903103d0$%kim@samsung.com> (Kyoungil Kim's message of "Mon, 22 Oct 2012 20:01:00 +0900") Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Kyoungil Kim Cc: linux-mmc@vger.kernel.org Hi, On Mon, Oct 22 2012, Kyoungil Kim wrote: > We used only single sg entry for SDIO transfer. > This chagne is to use multiple sg entry. > In case of dwmci, it support only up to 4KB size per single sg entry. > So if we want to transfer more than 4KB, we should send more than 1 command. > This makes performance degradation for large data transfer. > > Signed-off-by: Kyoungil Kim Can you share the before/after benchmark on your controller, please? Thanks, - Chris. -- Chris Ball One Laptop Per Child