Date: Tue, 25 Oct 2005 11:42:46 +0200 From: Lukas Razik <lukas@razik.de> To: JosephKoshy <joseph.koshy@gmail.com> Cc: freebsd-performance@freebsd.org Subject: Re: Performance issue with 5.4-RELEASE-p8 but not with 5.4-RELEASE Message-ID: <378216560@web.de>
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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
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