From: Virtbie Subject: Clock skew after pausing guests Date: Thu, 17 Mar 2011 15:24:31 +0100 Message-ID: <4D82199F.6030703@shiftmail.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit To: qemu-devel@nongnu.org, "'KVM-ML (kvm@vger.kernel.org)'" Return-path: Received: from mx2.isti.cnr.it ([194.119.192.4]:1306 "EHLO mx2.isti.cnr.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752955Ab1CQOZo (ORCPT ); Thu, 17 Mar 2011 10:25:44 -0400 Received: from SCRIPT-SPFWL-DAEMON.mx.isti.cnr.it by mx.isti.cnr.it (PMDF V6.5-x5 #31825) id <01NZ0VY3G57KQKFW8V@mx.isti.cnr.it> for kvm@vger.kernel.org; Thu, 17 Mar 2011 15:24:40 +0100 (MET) Received: from conversionlocal.isti.cnr.it by mx.isti.cnr.it (PMDF V6.5-x5 #31825) id <01NZ0VY30GSGQKFWAB@mx.isti.cnr.it> for kvm@vger.kernel.org; Thu, 17 Mar 2011 15:24:38 +0100 (MET) Sender: kvm-owner@vger.kernel.org List-ID: Hello all I am seeing, perhaps unsurprisingly, a skewed system clock after pausing and then resuming a qemu-kvm guest. The guest continues with its earlier time. Since I'd like to use the pause technique for backups, which can take 1 hour, this is significant. This is with windows guests, and it doesn't seem to recover by itself just by waiting. Linux guests instead seem to adjust their clock correctly after the resume. Is there any way to tell the windows guests to resynchronize its clock with the host? I am using virsh / libvirt. Thank you