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


[Xen-users] Windows and Multiple CPUS?

To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] Windows and Multiple CPUS?
From: "Andrew Lyon" <andrew.lyon@xxxxxxxxx>
Date: Fri, 19 Sep 2008 14:39:05 +0100
Delivery-date: Fri, 19 Sep 2008 06:39:45 -0700
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:mime-version:content-type:content-transfer-encoding :content-disposition; bh=8EfWTDSrVcfjzLo31k/WPUs9IQfJCTnUXs5aGQSOo2Y=; b=LlRiXRKRFE64Kid2GWD+6JbadjcduFfG2M2bcKwIghXY0uSCGgWlFWGYMpliSEvXM4 xaBg2qQefZenudJ6SWKTM23pquyO7ze6qRdUc0rDyewqEpOSgGduAB7F6WYNV1zymTIA VKF2fyQplPBTUuDweenQbyvKkBxkVAQsG9kEE=
Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type :content-transfer-encoding:content-disposition; b=GvXJlgr9jFVxpZekYT0DqFGSQLIgmd0AV5CGDxbiAooDlLdLJXYpebJAUNCaws7APJ mnULjjY74gbXAnARrHorgxK9z1iivv5QeEKAKtpEcuUQjw/o8MTSfG1xn68NPzLcAQ9D 2L2/Ag1zsj/YCVcgtlCB0PAvzzGC6mvcBBTqA=
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
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/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx

Am I correct in thinking that when Xen is running on a multi-core /
smp system and several cpus are assigned to a VM they are "presented"
as multiple single core cpus rather than 1 or more multi-core cpus?

Microsoft CPU limits are for physical sockets, not cores.

Windows XP and Vista are limited to two physical cpus, running under
Xen the maximum cpus I have seen in task manager and system properties
is 2, although device manager shows all of the assigned cpus (up to

Windows 2003 and 2008 standard edition are limited to 4 cpus, which is
the limit I find under Xen, again device manager shows all assigned
cpus (up to 8).

Is there any way to make windows see the cpus as multi-core so that
all 8 cores can be used ?


Xen-users mailing list

<Prev in Thread] Current Thread [Next in Thread>