From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keir Fraser Subject: Re: [RFC] [PATCH] use "reliable" tsc properly when available, but verify Date: Tue, 29 Sep 2009 18:17:34 +0100 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: 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 , "Xen-Devel (E-mail)" List-Id: xen-devel@lists.xenproject.org On 29/09/2009 16:51, "Dan Magenheimer" wrote: > This proposed patch is really only important for Phase > II, but given all the confusion around whether tsc is > reliable/safe/constant/nonstop on various machines, > I think it might be good to get code into Xen -- > sooner rather than later -- that "measures" this > so we can confirm if the promises made by processor > and system vendors are (or are not) being delivered. > > Does that make more sense? That makes it a nice-to-have. But not nice enough to have all CPUs groove off for 2ms every once in a while, imo. -- Keir