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

[PattiMichelle <miche1@xxxxxxxxxxxxx>]

openSuSE 11.0 (with a Xen kernel) boots multi-cpu and shows 32 CPUs, and Xen will give 8 (the max number of sockets Win2k3ServerEnt. supports) CPUs to the VM.  So I need to know how to get Xen to, say, give 2 VCPUs per socket to the VM.

------------------------------

Message: 3
Date: Thu, 29 Jan 2009 11:38:33 -0500
From: tmac <tmacmd@xxxxxxxxx>
Subject: Re: [Xen-users] Re: Windows and Multiple CPUS?
To: PattiMichelle <miche1@xxxxxxxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Message-ID:
	<73699aa30901290838r5d3e3f6apab23e02694ed3ef9@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1

Have you tried looking in the BIOS?

I have noticed that many boards have the "multi-core feature" disabled
by default.

Probably worth a reboot/check?

--tmac

RedHat Certified Engineer #804006984323821 (RHEL4)
RedHat Certified Engineer #805007643429572 (RHEL5)

Principal Consultant




On Thu, Jan 29, 2009 at 10:34 AM, PattiMichelle <miche1@xxxxxxxxxxxxx> wrote:
  

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  :^)

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To: "Andrew Lyon" <andrew.lyon@xxxxxxxxx>,<Dustin.Henning@xxxxxxxxxxx>
Subject: RE: [Xen-users] Re: Windows and Multiple CPUS?
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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
    

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