From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: So strange, time becomes skew when VM is running Date: Mon, 22 Oct 2007 11:59:14 +0200 Message-ID: <471C7472.6050906@qumranet.com> References: <393046937.11701@ustc.edu.cn> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: Feng Wang Return-path: In-Reply-To: <393046937.11701-pcTkQGq1WEvM1kAEIRd3EQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org Feng Wang wrote: > When I started up two KVM VMs upon SLES 10 OS based on a multi-core hardware > platform and ran some computing-intensive tasks (e.g. SPECjbb2005) within each VM, > I found that something confusing me very much. > The VM which is first started is running as well as it runs without other VMs, > The first VM is probably using the RTC as the time source; unfortunately only one process can use the RTC at a time. If you use newer kvms (and newer host kernels), and configure HZ appropriately (dynamic tick or HZ=1000), then timing should be much better for all VMs. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/