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Date: Sat, 08 Oct 2005 01:31:19 -0700
From: Paul Saab <ps@freebsd.org>
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To: Joseph Koshy <joseph.koshy@gmail.com>,  arch@freebsd.org
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Subject: Re: Determining CPU topology on multi-core CPUs
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you want hyperthreading_cpus_mask

Joseph Koshy wrote:
> On multi-core P4/HTT CPU packages I need to distinguish between
> physically distinct CPUs in separate cores from HT CPU
> (a.k.a., 'threads') pairs.
>
> What is the best way a driver can obtain the CPU topology
> of a system?
>
> The bits in 'logical_cpus_mask'  do not distinguish between
> multi-core and HT cpus.
>
> --
> FreeBSD Volunteer,     http://people.freebsd.org/~jkoshy
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