WARNING - OLD ARCHIVES

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/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

RE: [Xen-users] Re: Windows and Multiple CPUS?

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Re: Windows and Multiple CPUS?
From: PattiMichelle <miche1@xxxxxxxxxxxxx>
Date: Thu, 29 Jan 2009 07:34:14 -0800
Delivery-date: Thu, 29 Jan 2009 07:34:48 -0800
Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=JK+6kgKSETDyQ5Hxqu/pew0jKVTyDi4itCsIvSL+26lHup29v1hcb8H4EUm9M6OT; h=Received:Message-ID:Disposition-Notification-To:Date:From:User-Agent:MIME-Version:To:Subject:X-Enigmail-Version:Content-Type:X-ELNK-Trace:X-Originating-IP;
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
User-agent: Thunderbird 2.0.0.19 (X11/20081227)
OK, I bought the paperback book "Running Xen" and the only reference to this 
issue I could find was hotplugging CPUs, which won't work for me since
Win2K3Server supports 8 sockets and I'm seeing now 8 CPUs (obviously
8 single-CPU processors).  I need to set more CPUs per socket (I have
8 quad-cores).  I also searched for the example file:

/etc/xen/ xmexample.hvm-stubdom

but it was not in my root directory tree.  The example *almost* 
looks like a binary format but seems obscure.  How would one set, 
say 4 CPUs per socket for all CPUs?

Thank You Very Much,
Patti  :^)

=================================================================
=================================================================
To: "Andrew Lyon" <andrew.lyon@xxxxxxxxx>,<Dustin.Henning@xxxxxxxxxxx>
Subject: RE: [Xen-users] Re: Windows and Multiple CPUS?
From: "Robert Dunkley" <Robert@xxxxxxxxx>
Date: Mon, 29 Sep 2008 15:02:13 +0100
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Mon, 29 Sep 2008 07:04:48 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-users-request@xxxxxxxxxxxxxxxxxxx?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@xxxxxxxxxxxxxxxxxxx>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@xxxxxxxxxxxxxxxxxxx?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@xxxxxxxxxxxxxxxxxxx?subject=unsubscribe>
References: <f4527be0809190639p55c70370yb809739422db36ed@xxxxxxxxxxxxxx><f4527be0809190646p1cfd103dj60e15abdeb4c57df@xxxxxxxxxxxxxx><f4527be0809280644w29ad82b0wa9496b27cb382d87@xxxxxxxxxxxxxx><5872164101243113643@unknownmsgid> <f4527be0809290650jbbed5e7ie74fc00d24ecaf09@xxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AckiOj7K4pP/4wY5TjC446yZxU9N4wAAUFqA
Thread-topic: [Xen-users] Re: Windows and Multiple CPUS?
Hi Andrew,

Very interesting.

The trouble is that I don't understand the examples. Can anyone advise
on how to make 2,3 and 4 AMD cpu assigned VMs appear as a single
multicore CPU? I'm interested in how doing this may affect software
optimizations and NUMA type detection within HVMs.

Thanks,

Rob

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Andrew Lyon
Sent: 29 September 2008 14:51
To: Dustin.Henning@xxxxxxxxxxx
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Re: Windows and Multiple CPUS?

You need Xen 3.3, examples are shown in /etc/xen/ xmexample.hvm-stubdom:

#   Expose to the guest multi-core cpu instead of multiple processors
# Example for intel, expose a 8-core processor :
#cpuid=['1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,
#          ebx=xxxxxxxx00010000xxxxxxxxxxxxxxxx',
#     '4,0:eax=001111xxxxxxxxxxxxxxxxxxxxxxxxxx']
#  - CPUID.1[EDX][HT] : Enable HT
#  - CPUID.1[EBX] : Number of vcpus * 2
#  - CPUID.4,0[EAX] : Number of vcpus * 2 - 1
#vcpus=8



I used a single line to set the cpuid:

cpuid=['1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,ebx=xxxxxxxx00010000xxxxx
xxxxxxxxxxx','4,0:eax=001111xxxxxxxxxxxxxxxxxxxxxxxxxx']
vcpus=8

Andy

On Mon, Sep 29, 2008 at 12:49 PM, Dustin Henning
<Dustin.Henning@xxxxxxxxxxx> wrote:
>        Awesome, mind telling us how you figured this out?  Is it
documented
> somewhere?  I have seen several people want to do this, and someone
always
> tells them it is not possible.
>        Dustin
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Andrew
Lyon
> Sent: Sunday, September 28, 2008 09:44
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Re: Windows and Multiple CPUS?
>
> On Fri, Sep 19, 2008 at 2:46 PM, Andrew Lyon <andrew.lyon@xxxxxxxxx>
wrote:
>> On Fri, Sep 19, 2008 at 2:39 PM, Andrew Lyon <andrew.lyon@xxxxxxxxx>
> wrote:
>>> Hi,
>>>
>>> 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
>>> 8).
>>>
>>> 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 ?
>>>
>>> Andy
>>>
>>
>> I've also noticed that if I run "xm list" repeatedly as the VM is
>> starting up I can actually see the cpus being initialized, the value
>> matches the limit i find in windows:
>>
>> A Windows 2003 R2 Standard Edition 32 Bit VM:
>>
>> #grep vcpu Win2003x86.cfg
>> vcpus=8
>>
>> xm list (several times during boot process)
>>
>> Win2003x86                                  24  2048     1
>> Win2003x86                                  24  2048     2
>> Win2003x86                                  24  2048     3
>> Win2003x86                                  24  2048     4
>>
>> But if i booted this version of windows on the raw hardware all 8
cpus
>> would be utilized.
>>
>> Andy
>>
>
> I found the solution to this problem, in my hvm windows config file I
added:
>
>
cpuid='1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,ebx=xxxxxxxx00010000xxxxxx
xxxx
> xxxxxx','4,0:eax=001111xxxxxxxxxxxxxxxxxxxxxxxxxx']
> vcpus=8
>
> Which makes the 8 CPUs appear to the guest os as a single 8 core
> rather than 8 separate cpus, as windows is limited to 2 sockets it now
> sees all 8 cores in task manager.
>
> Andy
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
>
>
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users
<Prev in Thread] Current Thread [Next in Thread>