From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 1BB187F82 for ; Mon, 8 Jul 2013 19:56:24 -0500 (CDT) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay3.corp.sgi.com (Postfix) with ESMTP id 9C7C1AC003 for ; Mon, 8 Jul 2013 17:56:22 -0700 (PDT) Received: from imap.thunk.org (li9-11.members.linode.com [67.18.176.11]) by cuda.sgi.com with ESMTP id 3XSlFUZUXytMusjl (version=TLSv1 cipher=AES128-SHA bits=128 verify=NO) for ; Mon, 08 Jul 2013 17:56:21 -0700 (PDT) Date: Mon, 8 Jul 2013 20:56:13 -0400 From: Theodore Ts'o Subject: Re: Some baseline tests on new hardware (was Re: [PATCH] xfs: optimise CIL insertion during transaction commit [RFC]) Message-ID: <20130709005613.GA6000@thunk.org> References: <1372657476-9241-1-git-send-email-david@fromorbit.com> <20130708124453.GC3438@dastard> <20130708135953.GF5988@quack.suse.cz> <51DAD943.6050703@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <51DAD943.6050703@gmail.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Marco Stornelli Cc: linux-fsdevel@vger.kernel.org, Jan Kara , xfs@oss.sgi.com On Mon, Jul 08, 2013 at 05:22:43PM +0200, Marco Stornelli wrote: > > Funny, if I well remember Google guys switched android from yaffs2 > to ext4 due to its superiority on SMP :) The bigger reason why was because raw NAND flash doesn't really make sense any more; especially as the feature size of flash cells has shrunk and with the introduction of MLC and TLC, you really need to use hardware assist to make flash sufficiently reliable. Modern flash storage uses dynamic adjustment of voltage levels as the flash cells age, and error correcting codes to compensate for flash reliability challenges. This means accessing flash using eMMC, SATA, SAS, etc., and that rules out YAFFS2. - Ted _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs