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Re: cvs commit: src/sys/amd64/amd64 mp_machdep.c src/sys/i386/i386 mp_machdep.c

From: Colin Percival (cpercivafreebsd.org)
Date: Mon Apr 24 2006 - 16:50:26 CDT

Stefan Bethke wrote:
> Am 24.04.2006 um 23:17 schrieb Colin Percival:
>> FreeBSD src repository
>>
>> Modified files:
>> sys/amd64/amd64 mp_machdep.c
>> sys/i386/i386 mp_machdep.c
>
> I do not pretend to understand the background, but from your description
> it sounds like performance on Core Duo machines will be bad unless this
> change is made, or the potentially dangerous sysctl is active. If that
> is indeed the case, will this change make it into 6.1?

I'm not part of the release engineering team, but I think they're hoping
to merge this before the release, yes.

If anyone has a Core Duo system running -CURRENT and can tell me what
# sysctl machdep.hyperthreading_allowed
# sysctl machdep.hlt_cpus
says before and after this change, it would probably speed up the process
of merging this into other branches.

Colin Percival

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