From: tytso@mit.edu Subject: Re: [patch/rft] jbd2: tag journal writes as metadata I/O Date: Mon, 5 Apr 2010 17:01:33 -0400 Message-ID: <20100405210133.GG23670@thunk.org> References: <20100405175205.GA4681@thunk.org> <20100405194803.GC23670@thunk.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, jens.axboe@oracle.com, esandeen@redhat.com To: Jeff Moyer Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Mon, Apr 05, 2010 at 04:41:48PM -0400, Jeff Moyer wrote: > > Sorry, Ted, what I meant to say was that iozone showed differences > > between deadline and cfq, where cfq's performance was much worse than > > deadline's. > > And to be 100% clear, with the patch, the performance differences > between deadline and cfq were in the noise. Right, and since most people don't actually change the I/O scheduler from cfq, this is basically a performance improvement patch, which is how I'm going to describe it. :-) - Ted