From mboxrd@z Thu Jan 1 00:00:00 1970 From: Seungwon Jeon Subject: RE: [PATCH v9 0/2] mmc: support packed command feature of eMMC4.5 Date: Tue, 12 Feb 2013 19:53:31 +0900 Message-ID: <001f01ce090f$329c3320$97d49960$%jun@samsung.com> References: <003001ce0440$04844b40$0d8ce1c0$%jun@samsung.com> <87liaupvny.fsf@octavius.laptop.org> <201302112007.10195.arnd.bergmann@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: 7bit Return-path: Received: from mailout1.samsung.com ([203.254.224.24]:45060 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756820Ab3BLKxd (ORCPT ); Tue, 12 Feb 2013 05:53:33 -0500 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0MI3002JFSX4MTO0@mailout1.samsung.com> for linux-mmc@vger.kernel.org; Tue, 12 Feb 2013 19:53:32 +0900 (KST) Received: from DOTGIHJUN01 ([12.23.118.161]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0MI3006MDSX7O880@mmp1.samsung.com> for linux-mmc@vger.kernel.org; Tue, 12 Feb 2013 19:53:31 +0900 (KST) In-reply-to: <201302112007.10195.arnd.bergmann@linaro.org> Content-language: ko Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: 'Arnd Bergmann' , 'Chris Ball' Cc: linux-mmc@vger.kernel.org, 'Maya Erez' , 'Subhash Jadavani' , "'S, Venkatraman'" , 'Saugata Das' , 'Namjae Jeon' On Tuesday, February 12, 2013, Arnd Bergmann wrote: > On Monday 11 February 2013, Chris Ball wrote: > > On Wed, Feb 06 2013, Seungwon Jeon wrote: > > > This patch-set adds support of packed command feature for eMMC4.5 devices. > > > Specially, packed write is introduced. > > > > Thanks, I've pushed this to mmc-next for 3.9 now. > > > > It would be great to see benchmarks for the effect on average write > > latency, instead of just throughput, though. > > Yes, I agree absolutely. In the end, it's always the latency that > matters for user experience not the maximum throughput. I didn't see a significant difference in random I/O. Write packing completely depends on seamless I/O from block layer. As size of media contents is bigger, enhanced write is required in some user scenarios. I guess write throughput is important factor cannot be easily ignored. Thanks, Seungwon Jeon > > Arnd > -- > 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