From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=43132 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OF67t-0007bC-DE for qemu-devel@nongnu.org; Thu, 20 May 2010 09:49:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OF67n-0006Lv-SF for qemu-devel@nongnu.org; Thu, 20 May 2010 09:49:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:53322) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OF67n-0006Lj-LA for qemu-devel@nongnu.org; Thu, 20 May 2010 09:49:23 -0400 Message-ID: <4BF53DDD.20103@redhat.com> Date: Thu, 20 May 2010 15:49:17 +0200 From: Jes Sorensen MIME-Version: 1.0 Subject: Re: [Qemu-devel] [PATCH] QEMU: change default disk cache behavior References: <1274347924-9188-1-git-send-email-Jes.Sorensen@redhat.com> <4BF52B64.1020903@codemonkey.ws> <4BF53AEE.10207@redhat.com> <4BF53BB6.5060402@codemonkey.ws> In-Reply-To: <4BF53BB6.5060402@codemonkey.ws> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: hch@infradead.org, aliguori@us.ibm.com, qemu-devel@nongnu.org, crobinso@redhat.com On 05/20/10 15:40, Anthony Liguori wrote: > On 05/20/2010 08:36 AM, Jes Sorensen wrote: >>> And I strongly suspect that such a blanket change would be wrong but >>> that a more targeted change like making cache=none default for physical >>> devices would satisfy mostly everyone. >>> >> Is there any other thing than physical devices attached to the -drive >> parameter? > > Image files which are the overwhelming more common use-case. For image files we certainly want it too, at least for proper ones (ie. raw). It could be that it causes problems for qcow2. I'll try and look at it when I am back. Cheers, Jes