[PATCH] AMD multicore detection

David O'Brien obrien at FreeBSD.org
Mon Sep 26 09:04:32 PDT 2005


On Wed, Sep 21, 2005 at 03:50:24PM -0400, Jung-uk Kim wrote:
> I renewed my multicore detection patch, which was originally posted 
> here:
> 
> http://docs.freebsd.org/cgi/mid.cgi?200505181935.18493.jkim
> http://docs.freebsd.org/cgi/mid.cgi?200505182007.28631.jkim
> 
> New patch is here:
> http://people.freebsd.org/~jkim/multicore.diff

I've got something I'm working on for AMD dual-core.  Please don't commit
this.  We work just fine on AMD dual-core.  The patch to disable cores on
Intel Hyperthreaded CPU's does not affect AMD dual-core in one bit.  The
author nicely took the different vendors into account.

AMD sets the CPUID.HTT simply for licensing issues - something that does
not affect FreeBSD at all.

If there is something needed for Intel dual-core CPU's with
HyperThreading to use the real cores, but not the virtual cores - then by
all means please commit it.

> Please test and let me know.  I don't have multicore CPU to test it 
> for myself. :-(

I do and am working on something.
 
-- 
-- David  (obrien at FreeBSD.org)


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