kern/145385: [cpu] Logical processor cannot be disabled for
some SMT-enabled Intel procs
jhb at freebsd.org
Mon Aug 23 13:40:05 UTC 2010
The following reply was made to PR kern/145385; it has been noted by GNATS.
From: John Baldwin <jhb at freebsd.org>
To: Garrett Cooper <yaneurabeya at gmail.com>
Cc: bug-followup at freebsd.org,
gcooper at freebsd.org,
jkim at freebsd.org,
Attilio Rao <attilio at freebsd.org>
Subject: Re: kern/145385: [cpu] Logical processor cannot be disabled for some SMT-enabled Intel procs
Date: Mon, 23 Aug 2010 09:33:43 -0400
On Sunday, August 22, 2010 4:17:37 am Garrett Cooper wrote:
> The following trivial patch fixes the issue on my W3520 processor; AFAICS
it's what should be done after reading several of the specs because the
logical count that's tracked with ebx is exactly what is needed for
logical_cpus (it's an absolute quantity). I need to verify it with a multi-cpu
topology at work (the two r710s I was testing with E-series Xeons on aren't
available remotely right now).
Jung-uk Kim and Attilio Rao have both been looking at this code recently and
are in a better position to review the patch in the PR.
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