From owner-freebsd-performance@FreeBSD.ORG  Tue Oct 25 09:42:49 2005
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Date: Tue, 25 Oct 2005 11:42:46 +0200
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From: Lukas Razik <lukas@razik.de>
To: JosephKoshy <joseph.koshy@gmail.com>
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Cc: freebsd-performance@freebsd.org
Subject: Re: Performance issue with 5.4-RELEASE-p8 but not with 5.4-RELEASE
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Joseph Koshy <joseph.koshy@gmail.com> schrieb am 24.10.05 07:57:32:
> 
> On 10/24/05, Lukas Razik <lukas@razik.de> wrote:
> >
> > O.K.
> >
> > I've found the reason for the issue.
> > After exchanging the newer
> > src/sys/i386/include/cpufunc.h,v 1.142.6.1 2005/05/13 00:12:57
> > src/sys/i386/i386/mp_machdep.c,v 1.235.2.6.2.3 2005/05/13 00:12:56
> > from 5.4-RELEASE-p1 by the old
> >
> > src/sys/i386/include/cpufunc.h,v 1.142 2004/04/07 20:46:05
> > src/sys/i386/i386/mp_machdep.c,v 1.235.2.6.2.2 2005/05/01 05:38:13
> > from 5.4-RELEASE the issue disappeared.
> 
> >From the CVS commit log for this change at:
> 
>   http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/i386/mp_machdep.c?only_with_tag=RELENG_5_4
> 
>   "Add a knob for disabling/enabling HTT, "machdep.hyperthreading_allowed".
>    Default off due to information disclosure on multi-user systems."
> 
> Does turning HTT back on fix the regression?
> 

Yes, it does! :-) Many thanks!!!
Nice to know this important detail...

Regards,
Lukas