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] Re: c/s 21118: Magny-Coure breakage

To: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: c/s 21118: Magny-Coure breakage
From: Andre Przywara <andre.przywara@xxxxxxx>
Date: Mon, 12 Apr 2010 15:14:16 +0200
Cc: Christoph Egger <Christoph.Egger@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Delivery-date: Mon, 12 Apr 2010 06:15:34 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <2b65e57c-ff10-4d40-a06c-94d738a6e011@default>
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/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <C7E8B76F.105C8%keir.fraser@xxxxxxxxxxxxx C7E8BBE4.105CC%keir.fraser@xxxxxxxxxxxxx> <2b65e57c-ff10-4d40-a06c-94d738a6e011@default>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Thunderbird (X11/20090329)
Dan Magenheimer wrote:
A large number of software licensing beancounters in the industry
are going to be busy on this one ;-)
Yes, but do they use the Xen hypervisor interface for that? And do they look at the actual socket number? As far as I remember some companies ;-) are counting MCMs twice, so actually counting the nodes?

Christophe, can you comment on how Linux and/or other bare metal
operating systems will be reporting the Magny Cours hierarchy?
As long as there is no such notion as 'sockets per node' (which isn't on Linux), everything is fine. It will just report 8 nodes with 6 cores each (in case of a 4 socket M-C). Each core has a associated physical package id, which is just the same for 12 cores or 2 nodes. I have a machine here up and running, so just tell me what sysfs path you are interested in and I can send you the output.

I'd hope that Xen could follow their lead on this rather
than forge new ground, which may result in an incompatible
Until c/s 21118 Xen was just fine, reporting 8 nodes, 4 sockets and 48 cores. It is just this socket per node (which got removed some years ago), which is doing harm. (BTW: I already complained about that last year, when Nitin's patch first appeared on the ML).


Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 448-3567-12

Xen-devel mailing list