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-users] Release 0.8.9 of GPL PV drivers for Windows

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Release 0.8.9 of GPL PV drivers for Windows
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Wed, 7 May 2008 11:40:30 +0300
Cc: Todd Deshane <deshantm@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx, jim burns <jim_burn@xxxxxxxxxxxxx>
Delivery-date: Wed, 07 May 2008 01:41:04 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <AEC6C66638C05B468B556EA548C1A77D013DC816@trantor>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <20080507063458.GF20425@xxxxxxxxxxxxxxx> <AEC6C66638C05B468B556EA548C1A77D013DC816@trantor>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.13 (2006-08-11)
On Wed, May 07, 2008 at 04:58:43PM +1000, James Harper wrote:
> > 
> > And more thing for the number of vcpu's for the HVM guest.. I think
> > Windows
> > installs UNI or SMP HAL during the install time.. I don't know what kind
> > of
> > effect there is if you run SMP HAL with only a single (v)CPU ?
> > 
> The first time you start a previously UP windows DomU with more than a single 
> vcpu, 
> you get a message like 'your system must be rebooted for your new hardware to 
> complete installation', and sure enough you don't see the additional CPU(s) 
> in 
> process monitor until you reboot.
> Subsequent changes to and from SMP don't do the same thing, so it is possible 
> that the first time you boot with >1 cpu an SMP hal gets installed, and that 
> it 
> doesn't get uninstalled afterwards... In a physical as opposed to virtual 
> environment 
> this kind of makes sense - how often are you going to take an SMP machine 
> back to 
> a single processor unless you have a hardware failure or something, which 
> will 
> probably only be temporary anyway until the replacement cpu arrives?


Do you know if running the SMP HAL with just a single vcpu will cause any
performance degrations? 

-- Pasi

Xen-users mailing list