From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=45946 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OE04a-0002T8-5i for qemu-devel@nongnu.org; Mon, 17 May 2010 09:09:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OE04Y-0006id-AI for qemu-devel@nongnu.org; Mon, 17 May 2010 09:09:31 -0400 Received: from mail-gw0-f45.google.com ([74.125.83.45]:37833) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OE04Y-0006iZ-7V for qemu-devel@nongnu.org; Mon, 17 May 2010 09:09:30 -0400 Received: by gwj17 with SMTP id 17so1273466gwj.4 for ; Mon, 17 May 2010 06:09:29 -0700 (PDT) Message-ID: <4BF14007.2060603@codemonkey.ws> Date: Mon, 17 May 2010 08:09:27 -0500 From: Anthony Liguori MIME-Version: 1.0 References: <1274091292-4812-1-git-send-email-agraf@suse.de> <4BF13D5E.8090006@codemonkey.ws> <8397DB3E-B470-4FBD-903E-8B547631A825@suse.de> In-Reply-To: <8397DB3E-B470-4FBD-903E-8B547631A825@suse.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] Re: [PATCH] Add cache=volatile parameter to -drive List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Alexander Graf Cc: kwolf@redhat.com, qemu-devel@nongnu.org, hch@lst.de On 05/17/2010 08:02 AM, Alexander Graf wrote: >> My concern is that ext3 exaggerates the cost of fsync() which will result in diminishing value over time for this feature as people move to ext4/btrfs. >> > There will be ext3 file systems for years out. Just because people can use better and faster file systems doesn't mean they do. And I'm sure they can't always choose. If anything, I can try and see what the numbers look like for xfs. > But ext3 with barrier=1 is pretty uncommon in practice. Another data point would be an ext3 host file system with barrier=0. Regards, Anthony Liguori > > Alex > >