From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rik van Riel Subject: Re: Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options. Date: Sat, 17 Feb 2007 10:06:40 -0500 Message-ID: <45D71A00.5080104@redhat.com> References: <45D62759.7080006@vmware.com> <45D63255.2070801@vmware.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <45D63255.2070801@vmware.com> 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 Hecht Cc: Zachary Amsden , xen-devel@lists.xensource.com, Andi Kleen , Steven Hand , linux-kernel@vger.kernel.org, Ian Pratt , Chris Wright , virtualization@lists.osdl.org, Andrew Morton , Keir Fraser , Christian Limpach List-Id: virtualization@lists.linuxfoundation.org Dan Hecht wrote: > Yes, and regardless of whether you run your periodic timer slower than > HZ, calibrating time in a VM is always difficult due to the fact the > kernel is time sharing the physical cpu. Why not just ask the > underlying hypervisor? Upstream Xen does just that. I'm guessing we'll want something similar for KVM paravirt. -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946775AbXBQPJG (ORCPT ); Sat, 17 Feb 2007 10:09:06 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1946776AbXBQPJG (ORCPT ); Sat, 17 Feb 2007 10:09:06 -0500 Received: from mx1.redhat.com ([66.187.233.31]:50510 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1946775AbXBQPJF (ORCPT ); Sat, 17 Feb 2007 10:09:05 -0500 Message-ID: <45D71A00.5080104@redhat.com> Date: Sat, 17 Feb 2007 10:06:40 -0500 From: Rik van Riel Organization: Red Hat, Inc User-Agent: Thunderbird 1.5.0.7 (X11/20061008) MIME-Version: 1.0 To: Dan Hecht CC: Zachary Amsden , Keir Fraser , Chris Wright , virtualization@lists.osdl.org, xen-devel@lists.xensource.com, Christian Limpach , Andi Kleen , Andrew Morton , Steven Hand , linux-kernel@vger.kernel.org, Ian Pratt Subject: Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options. References: <45D62759.7080006@vmware.com> <45D63255.2070801@vmware.com> In-Reply-To: <45D63255.2070801@vmware.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Dan Hecht wrote: > Yes, and regardless of whether you run your periodic timer slower than > HZ, calibrating time in a VM is always difficult due to the fact the > kernel is time sharing the physical cpu. Why not just ask the > underlying hypervisor? Upstream Xen does just that. I'm guessing we'll want something similar for KVM paravirt. -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic.