RE: [Xen-users] Adding more vCPUs to Windows 2003 standard, from 2 to 4

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

Yes. You heed to shutdown. A reboot will not re-read the config file.

-----Original Message-----
From: "Pekka.Panula@xxxxxxxx"<Pekka.Panula@xxxxxxxx>
Sent: 6/08/08 5:39:12 PM
To: "xen-users@xxxxxxxxxxxxxxxxxxx"<xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Adding more vCPUs to Windows 2003 standard,from 2 to 4

"James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote on 06.08.2008 
10:23:48:

> > xm list says 2 VCPUs is on use.
> 
> Just recently I set up a Windows 2003 DomU (I think it was enterprise
> though) under 4 CPU's, and while booting 'xm list' showed an increasing
> number of vcpu's attached until it reached 4.
> 
> When you go from UP to SMP, the first time you boot you get a message
> that windows had finished installing your hardware but you need to
> reboot, and sure enough you only have one CPU until you reboot. 

These two servers are installed so that they did have 2 processors set 
since from first boot and Windows device managers shows ACPI 
multiprocessor PC so i am assuming Windows should discover new processors 
automagicly? 

> I have not had such a problem going from 2 processors to 4 though.
> 
> What version of Xen are you using? Do you have ACPI and APIC enabled?

Here is my xm info output:
release                : 2.6.18-92.1.6.el5xen
version                : #1 SMP Wed Jun 25 14:13:10 EDT 2008
machine                : x86_64
nr_cpus                : 8
nr_nodes               : 1
sockets_per_node       : 2
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2500
hw_caps                : 
bfebfbff:20000800:00000000:00000140:000ce3bd:00000000:00000001
total_memory           : 16383
free_memory            : 4478
node_to_cpu            : node0:0-7
xen_major              : 3
xen_minor              : 1
xen_extra              : .2-92.1.6.el5
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 
hvm-3.0-x86_32p hvm-3.0-x86_64 
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
cc_compiler            : gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)
cc_compile_by          : mockbuild
cc_compile_domain      : centos.org
cc_compile_date        : Wed Jun 25 13:39:56 EDT 2008
xend_config_format     : 2

Also did check apic and acpi, they are on, eg. apic=1 and acpi=1

One question that might explain this problem, as servers were rebooted 
using Windows shutdown - reboot command, maybe its needed to bring them 
down completely or is standard reboot from Windows start menu enough?

Terveisin/Regards,
   Pekka Panula, Net Servant Oy - A Sofor company
   pekka.panula@xxxxxxxx

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