From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52053) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XMeJ5-0002t8-9c for qemu-devel@nongnu.org; Wed, 27 Aug 2014 10:34:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XMeIz-0001uv-1Z for qemu-devel@nongnu.org; Wed, 27 Aug 2014 10:34:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33957) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XMeIy-0001ug-RR for qemu-devel@nongnu.org; Wed, 27 Aug 2014 10:34:32 -0400 Message-ID: <53FDEC73.1020104@redhat.com> Date: Wed, 27 Aug 2014 16:34:27 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <1009168463.49610.1408133034828.JavaMail.zimbra@xes-inc.com> <985931631.51123.1408133895894.JavaMail.zimbra@xes-inc.com> <20140819145925.GB13680@stefanha-thinkpad.redhat.com> <838926932.102908.1408490438455.JavaMail.zimbra@xes-inc.com> <280510069.69184.1408990389981.JavaMail.zimbra@xes-inc.com> <53FC3136.50900@redhat.com> <731385877.87249.1409149425950.JavaMail.zimbra@xes-inc.com> In-Reply-To: <731385877.87249.1409149425950.JavaMail.zimbra@xes-inc.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Using cache=writeback safely on qemu 1.4.0 and later List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Andrew Martin Cc: Stefan Hajnoczi , qemu-devel Il 27/08/2014 16:23, Andrew Martin ha scritto: > Thanks for the info about this bug - I am using QEMU 1.4.0 (released on 02/15/13) > and ef5bc96268 was added on 09/20/13, so the bug had not been fixed in the version > of QEMU I am using. I have had trouble reproducing it on-demand - was there specific > behavior you used to reproduce it, or just the lack of fsyncs or fdatasyncs when > stracing the QEMU process when using cache=writeback? Just the lack of fdatasyncs. Paolo