From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751391Ab2ATFj7 (ORCPT ); Fri, 20 Jan 2012 00:39:59 -0500 Received: from mail-bk0-f46.google.com ([209.85.214.46]:53426 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751041Ab2ATFj4 convert rfc822-to-8bit (ORCPT ); Fri, 20 Jan 2012 00:39:56 -0500 MIME-Version: 1.0 In-Reply-To: References: <002501ccd728$baca1010$305e3030$%jun@samsung.com> Date: Fri, 20 Jan 2012 14:39:54 +0900 Message-ID: Subject: Re: [PATCH v3 0/2] mmc: core: Support packed command feature of eMMC4.5 From: Namjae Jeon To: Seungwon Jeon Cc: linux-mmc@vger.kernel.org, Chris Ball , linux-kernel@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi. Seungwon, Would you show improved performance measurement result(read/write,seq,ran) when using packed cmd ? Thanks. 2012/1/20 Kyungmin Park : > Hi, > > FYI: we get performance gain using packed command at write. however in > case of small size read, there are some performance drop since > protocol overhead. > In normal case, read command uses read operation only, but in case of > packed read. It sends the command to eMMC and read it. > Anyway it's good feature for eMMC v4.5. > > Acked-by: Kyungmin Park > > On 1/20/12, Seungwon Jeon wrote: >> This patch-set adds support of packed command feature >> for eMMC4.5 devices. >> >> Changes in v3: >>       - Add a variable member in mmc_host for minimum number of packed entries. >>         This value can be overrided by host. >>       - Fix a handling of error sequence. >> >> Changes in v2: >>       - Fix the packed read sequence and error handling. >>       - Apply checking the exception status for all cases with >>         the comments from Maya Erez and Sahitya Tummala. >>       - Fix preparing the packed list with the comment from Maya Erez and >> Venkatraman. >> >> >> Seungwon Jeon (2): >>       mmc: core: Add packed command feature of eMMC4.5 >>       mmc: core: Support packed command for eMMC4.5 device >> >>  drivers/mmc/card/block.c   |  469 >> +++++++++++++++++++++++++++++++++++++++++--- >>  drivers/mmc/card/queue.c   |   48 +++++- >>  drivers/mmc/card/queue.h   |   13 ++ >>  drivers/mmc/core/host.c    |    2 + >>  drivers/mmc/core/mmc.c     |   24 +++ >>  drivers/mmc/core/mmc_ops.c |    1 + >>  include/linux/mmc/card.h   |    3 + >>  include/linux/mmc/core.h   |    3 + >>  include/linux/mmc/host.h   |    4 + >>  include/linux/mmc/mmc.h    |   15 ++ >>  10 files changed, 555 insertions(+), 27 deletions(-) >> >> Best regards, >> Seungwon Jeon. >> -- >> 1.7.2.3 >> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at  http://vger.kernel.org/majordomo-info.html >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at  http://vger.kernel.org/majordomo-info.html > Please read the FAQ at  http://www.tux.org/lkml/