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RE: [Xen-devel] SMP on X86

  • To: "peter Bier" <peter_bier@xxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Kamble, Nitin A" <nitin.a.kamble@xxxxxxxxx>
  • Date: Tue, 18 Oct 2005 11:43:24 -0700
  • Delivery-date: Tue, 18 Oct 2005 18:41:08 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcXUEo6ODg3nqF65TleWv5DIclkJOQAADxSQ
  • Thread-topic: [Xen-devel] SMP on X86

   Xen Hypervisor by default is configured as SMP and also recognizes
Dom0 kernel by default is UP and it needs to be rebuilt enabling SMP, to
get multiple threads in the dom0. The steps you described looks ok to
   I am not very clear about your issue. Can you send this to understand
the issue better?
        1. native kernel dmesg (run with native linux kernel: dmesg)
        2. Xen console log: (run in dom0: xm dmesg)
        3. dom0 kernel dmesg (run in dom0: dmesg)

Thanks & Regards,
Open Source Technology Center, Intel Corp

>-----Original Message-----
>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
>bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of peter Bier
>Sent: Tuesday, October 18, 2005 11:30 AM
>To: xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: [Xen-devel] SMP on X86
>I compiled the unstable Version and enabled SMP as well as SMT in
Domain 0,
>but I see only one CPU on a System that has a hyperthreading CPU ( P4
630 )
>which is recognized by a native SMP/SMT Kernel.
>Is there anything I have to do to configure the Hypervisor to support
>SMT ? If this is the case, how can I achieve that Xen support
>I checked SMT using the abovementioned native kernel and achieved a
>enhancment of about 20 percent in comparison to a non-SMT kernel,
running a
>simple CPU-bound floating point program. I got no improvement when
>SMP/SMT kernel of Xen.
>Thanks in advance
>     Peter Bier
>Xen-devel mailing list

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