From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: RE: [PATCH] rendezvous-based local time
	calibration WOW!
Date: Mon, 11 Aug 2008 15:38:31 +0100
Message-ID: <C4C60D77.25537%keir.fraser@eu.citrix.com>
References: <20080811143713.GA17732@totally.trollied.org.uk>
Mime-Version: 1.0
Content-Type: text/plain;
	charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <20080811143713.GA17732@totally.trollied.org.uk>
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: John Levon <levon@movementarian.org>, Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Ian Pratt <Ian.Pratt@eu.citrix.com>, Nils Nieuwejaar <nils.nieuwejaar@gmail.com>, Dave Winchell <dwinchell@virtualiron.com>, "Xen-Devel (E-mail)" <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org




On 11/8/08 15:37, "John Levon" <levon@movementarian.org> wrote:

> It's only non-zero if we can indeed reschedule fast enough. If it's now
> below the threshold, then we can consider it effectively fixed. Only
> testing can really tell us that.

Depending on how critical this guarantee is, I wouldn't rely on Xen to
perform perfectly. Probably you should keep your lock.

 -- Keir