Messages in this thread | | | Date | Mon, 21 Mar 2016 09:21:29 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 2/3] x86/topology: Fix AMD core count |
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On Mon, Mar 21, 2016 at 11:07:46AM +0800, Huang Rui wrote: > > > The issue is that Linux assumes: > > > > > > nr_logical_cpus = nr_cores * nr_siblings > > > > > > But AMD reports its CU unit as 2 cores, but then sets num_smp_siblings > > > to 2 as well.
> But I am confused with c->x86_max_cores /= smp_num_siblings, what is > the real meaning of c->x86_max_cores here for AMD, the whole compute > unit numbers per socket?
Yes, with the whole Compute Unit being the Core, each logical CPU becomes a Thread. This is the direct consequence of using the SMT topology to model the CU thing.
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