From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: Re: Intel X25-M MLC SSD benchmarks Date: Fri, 12 Dec 2008 05:15:11 -0700 Message-ID: <20081212121511.GH26095@parisc-linux.org> References: <20081210213937.GC25548@parisc-linux.org> <83CA05F64804AF43B8F733C4ABDFAA51022D04D7@mail1.bitband.com> <311601c90812111927t54ed6a54oac3154dba30f737d@mail.gmail.com> <311601c90812112055i7ec955d6kf4fc13279817cdb0@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from palinux.external.hp.com ([192.25.206.14]:46515 "EHLO mail.parisc-linux.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756151AbYLLMPM (ORCPT ); Fri, 12 Dec 2008 07:15:12 -0500 Content-Disposition: inline In-Reply-To: <311601c90812112055i7ec955d6kf4fc13279817cdb0@mail.gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: "Eric D. Mudama" Cc: Raz Ben-Yehuda , linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org On Thu, Dec 11, 2008 at 09:55:56PM -0700, Eric D. Mudama wrote: > On 12/11/08, Eric D. Mudama wrote: > > Out of curiosity, is write cache enabled or disabled on these devices? > > Oops, I just noticed the oflag=direct, that can have a huge > performance difference depending on the block size. > > What numbers are you getting without oflag=direct? Without the oflag=direct option, you're measuring the performance of the Linux page cache. That's not very interesting. -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step."