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Date: Tue, 5 Apr 2016 01:14:46 +0000
From: Alexey Dokuchaev <danfe@FreeBSD.org>
To: Andriy Gapon <avg@FreeBSD.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r297558 - in head/sys: kern sys x86/x86
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On Mon, Apr 04, 2016 at 04:09:29PM +0000, Andriy Gapon wrote:
> New Revision: 297558
> URL: https://svnweb.freebsd.org/changeset/base/297558
> 
> Log:
>   new x86 smp topology detection code
>   
>   Previously, the code determined a topology of processing units
>   (hardware threads, cores, packages) and then deduced a cache topology
>   using certain assumptions.  The new code builds a topology that
>   includes both processing units and caches using the information
>   provided by the hardware.

Good work!  On a related note, would it make it easier/possible to start
thinking about if FreeBSD can export CPU cache information into userland?
Some applications want these bits...  Linux exports them via sysconf(3),
back in 2003 bms@ proposed preliminary design [1] and suggested sysctl(3).

./danfe

[1] https://lists.freebsd.org/pipermail/freebsd-hackers/2003-October/003604.html