From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Lalancette Subject: Re: Issues with multiple differing guest HZ rates? Date: Sun, 02 Mar 2008 22:14:26 -0500 Message-ID: <47CB6D12.80908@redhat.com> References: <20080302103054078.00000000436@djm-pc> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20080302103054078.00000000436@djm-pc> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "dan.magenheimer@oracle.com" Cc: "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org Dan Magenheimer wrote: > In a timer patch in RHEL5u1 (by Alan Cox), is the comment: > > "Xen itself has issues with multiple differing guest GZ rates" > (and I assume that GZ is a typo, should be HZ) > > Can anyone explain this further or are there experimental > results to back it up? We are seeing some strangeness with > running multiple pvm guests with different HZ rates and wonder > if this is related. I highly doubt it; in that comment, Alan was describing why he *didn't* implement the tick divider for Xen kernels. So that patch doesn't actually touch any Xen code in particular, and should in general not be touching much code that the -xen kernels share with the bare-metal kernel either. What's the problem you are seeing with different HZ rates in guests? Chris Lalancette