From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erik Rull Subject: Re: kvm-77 Excessive Disk Access causes real time clock hang! Date: Mon, 27 Apr 2009 01:12:08 +0200 Message-ID: <49F4EA48.2070208@rdsoftware.de> References: <49F1DAF5.2060805@rdsoftware.de> <49F43B77.4080102@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from moutng.kundenserver.de ([212.227.126.177]:54027 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751056AbZDZXMZ (ORCPT ); Sun, 26 Apr 2009 19:12:25 -0400 In-Reply-To: <49F43B77.4080102@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Hi Avi, Avi Kivity wrote: > Are you using qcow2? In some cases qcow2 will stall the guest cpu. > > Note that defragmenting the guest drive may cause the qcow2 file to > fragment even more, and will certainly increase its size. I recommend > only defragmenting when using raw storage. I don't think so. I created a partition on my host "real" harddrive and provided this partition to my windows guest. If you have an idea, which virtualized drive system could be the fastest (except giving a complete disk to the guest), your comments are welcome :-) Best regards, Erik