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RE: [Xen-ia64-devel] xen on hp rx2600

To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Subject: RE: [Xen-ia64-devel] xen on hp rx2600
From: Alex Williamson <alex.williamson@xxxxxx>
Date: Wed, 09 Nov 2005 22:53:07 -0700
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On Thu, 2005-11-10 at 13:21 +0800, Tian, Kevin wrote:
> Hi, Aron,
> Couple of questions here:
>       - Did you turn on the CONFIG_SMP for xen, which is default off now?
>       - Is it first time for all people on the list to run an hp box with
> SMP?
>       - Interesting thing is, xen only saw one cpu available:
>               >(XEN) 1 CPUs available, 1 CPUs total
>        However dom0 saw 2 CPUs available:
>               >2 CPUs available, 2 CPUs total
>        Do you know the tricks behind here? Does ACPI table get changed
> sometime later?
>       - Currently we have logic to enable only one CPU seen by dom0, as
> touch_acpi_table() in dom_fw_init. That can promise no spurious IPI
> issued before dom0 SMP (guest SMP) ready. Normally touch_acpi_table()
> will scan MADT table and enable only one entry. Could you check any
> logic here not adapting to your rx2600 box?

   FWIW, I've been playing around on the same kind of box.  On mine,
with non-smp xen I get to the same point, but the BSP gives up on the
secondary, reports it stuck and moves on (10 second timeout iirc).  I
think maybe the management processor is getting in the way for Aron.
When I enabled SMP in xen, it correctly saw 2 cpus and dom0 reported 1
cpu available, 2 cpus total.  Maybe the touch_acpi_table() is only
getting called in the SMP case?  Thanks,


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