[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Wrong number of sockets on IBM x3850 M2
On Thu, 2009-05-07 at 15:34 +0100, Keir Fraser wrote: > On 07/05/2009 15:06, "Gary Grebus" <ggrebus@xxxxxxxxxxxxxxx> wrote: > > > One of our customers has reported that Xen determines the wrong topology > > for their machines, identifying them as 6 sockets x 4 cores when in fact > > they are 4 sockets x 6 cores (Intel(R) Xeon(R) CPU X7460 @ 2.66GHz > > stepping 01). The systems are IBM x3850 M2. > > Where is this reported? Via the SYSCTL_physinfo hypercall? Right. > You might have to > work backwards from the cpu_sibling_map and cpu_core_map values which are > used there to derive the info returned by that hypercall. The fact that the > APIC IDs of the CPUs are pretty random and jumbled as the CPUs are brought > up should not matter. > cpu_sibling_map[] and cpu_core_map[] are built based on the phys_proc_id[] and cpu_core_id[] arrays, which are set based on phys_pkg_id(), which is what led me back to the APIC IDs. I suspect the jumbled IDs come from the BIOS, and that CPUID might report the real topology, but was hoping someone familiar with the platform might confirm that. /gary _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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