Date: Thu, 25 Aug 2005 00:35:37 -0700 From: Josh Carroll <josh.carroll@gmail.com> To: freebsd-current@freebsd.org Subject: Re: On a hyperthreaded system, top and gnome system monitor only report one processor Message-ID: <8cb6106e0508250035f066aa1@mail.gmail.com> In-Reply-To: <430D6C0F.1070909@freebsd.org> References: <430D68D4.50609@drexel.edu> <430D6C0F.1070909@freebsd.org>
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Speaking of which, is hyperthreading in 6.0 with ULE to the point where it actually increases performance for multi-threaded processes or parallel compilations (make -j N)? Obviously this is situation dependent. I guess the better question is whether HT is able to provide a performance increase in 6.0 like it purports to do? I've heard that it's not quite "there yet", so I'm cautious about enabled SMP support and HT support on a P4-HT system. Josh On 8/24/05, Colin Percival <cperciva@freebsd.org> wrote: > Justin R. Smith wrote: > > FreeBSD jsmith.org 6.0-BETA3 FreeBSD 6.0-BETA3 #0: Tue Aug 23 08:04:37 > > EDT 2005 jsmith@jsmith.org:/usr/obj/usr/src/sys/MYKERNEL i386 > > > > Top lists all process as being run by processor 0 > > > > The gnome system monitor lists only processor 0 as well (under gentoo > > linux it shows two). >=20 > Hyperthreading is disabled by default for security reasons. If you want > to enable it (which is generally safe on single-user systems), you should > add the following line to /boot/loader.conf : >=20 > machdep.hyperthreading_allowed=3D1 >=20 > Colin Percival > FreeBSD Security Officer > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org= " >
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