From: Marc MERLIN Subject: Re: How can btrfs take 23sec to stat 23K files from an SSD? Date: Tue, 31 Jul 2012 23:40:10 -0700 Message-ID: <20120801064010.GJ12695@merlins.org> References: <20120718220446.GB3888@merlins.org> <20120722185848.GA10089@merlins.org> <201207222135.11159.Martin@lichtvoll.de> <20120722204428.GC3925@merlins.org> <20120722224145.GC12951@merlins.org> <20120723064202.GB6931@merlins.org> <20120727110835.GA6933@shiny> <20120727184238.GA6713@merlins.org> <20120801060135.GH12695@merlins.org> <5018CE66.6050609@csamuel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Chris Mason , "linux-btrfs@vger.kernel.org" , Ted Ts'o , =?utf-8?B?THVrw6HFoQ==?= Czerner , linux-ext4@vger.kernel.org, axboe@kernel.dk, Milan Broz To: Chris Samuel Return-path: Received: from magic.merlins.org ([209.81.13.136]:43834 "EHLO mail1.merlins.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753517Ab2HAGkO (ORCPT ); Wed, 1 Aug 2012 02:40:14 -0400 Content-Disposition: inline In-Reply-To: <5018CE66.6050609@csamuel.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Wed, Aug 01, 2012 at 04:36:22PM +1000, Chris Samuel wrote: > On 01/08/12 16:01, Marc MERLIN wrote: > > > Third, A freshly made ntfs filesystem through fuse is actually FASTER! > > Could it be that Samsungs FTL has optimisations in it for NTFS ? > > A horrible thought, but not impossible.. Not impossible, but it's can be the main reason since it clocks still 2x slower with ntfs than a spinning disk with encrypted btrfs. Since SSDs should "seek" 10-100x faster than spinning disks, that can't be the only reason. Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/