Re: [Xen-devel] changeset 8831 gets sockets, cores, and siblings wrong

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 15 Feb 2006, at 21:21, Andrew Theurer wrote:

> FWIW, I noticed that changeset 8831 gets the sockets/cores/siblings 
> incorrect on my system.  On 8830 I get 4 sockets per node, 2 cores per 
> socket, and 2 threads per core.  On 8831 I get 1 socket per node, 2 
> cores per socket, and 8 threads per core.  Xen boot messages still 
> appear to show four distinct physical cpus (sockets).  Just wondering 
> if anyone has noticed this behavior.
This all stems from an incorrect value for smp_num_siblings. This could 
come from one of two places:
 1. Do you get a message 'WARNING: 8 siblings found for CPUx, should be 
2' during boot? If so, smpboot.c is screwing up the smp_num_siblings 
calculation.
 2. Otherwise, detect_ht() in arch/x86/cpu/common.c must be the 
culprit, and you'll need to add some tracing to it to find out where 
the value '8' is coming from.
 -- Keir


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