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

[Colin Percival]

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