This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


RE: [Xen-devel] [PATCH] new hvm platform vhpet enable parameter

To: "dan.magenheimer@xxxxxxxxxx" <dan.magenheimer@xxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH] new hvm platform vhpet enable parameter
From: "Stephen C. Tweedie" <sct@xxxxxxxxxx>
Date: Fri, 08 Feb 2008 12:50:34 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Fri, 08 Feb 2008 04:51:08 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <20080207112932718.00000003652@djm-pc>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Organization: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903
References: <20080207112932718.00000003652@djm-pc>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx

On Thu, 2008-02-07 at 11:29 -0700, Dan Magenheimer wrote:

> If Linux were using it as a timekeeping source, I think it would
> be (per earlier post by Dave Winchell), but on second look once
> HPET is disabled, Linux discovers pmtimer but still uses PIT/TSC
> based timekeeping.

Just one word of warning --- the Linux handling of PIT vs HPET vs
pmtimer has changed a lot over the years, and you might well find older
kernels handling these cases differently.  (I can't recall exact details
but I do remember seeing long discussions about the merits of the
different timers in different cases.)


Xen-devel mailing list