Date: Tue, 17 Mar 2009 07:14:02 -0700 (PDT) From: Won De Erick <won.derick@yahoo.com> To: freebsd-smp@FreeBSD.ORG, won.derick@yahoo.com, John Baldwin <jhb@FreeBSD.ORG>, Robert Heron <robert@heron.pl> Subject: Re: only one logical CPU used in Xeon Message-ID: <100058.54621.qm@web45803.mail.sp1.yahoo.com>
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--- On Tue, 3/17/09, Oliver Fromme <olli@lurza.secnetix.de> wrote:=0A> won.= derick@yahoo.com wrote:=0A> > John Baldwin wrote:=0A> > > in the ULE case= (though the sysctl doesn't work).=A0 If=0A> > > you use 4BSD on 7.1 =0A> = > > then the tunable and sysctl will work fine.=0A> > > =0A> > =0A> > I= tried this, but I can't see the variable being=0A> > displayed.=0A> =0A> = Then your machine doesn't support hyperthreading.=0A> =0A> The machdep.hype= rthreading_allowed sysctl is only present=0A> if your machine actually has = multiple logical CPUs.=0A> If you don't see that sysctl, then your processo= r doesn't=0A> have multiple hyperthreaded CPUs.=0A> =0A=0AThanks for that f= urther clarification. The dmesg has also justified this.=0A=0A#dmesg=0A...= =0ACores per package: 4=0A...=0AFreeBSD/SMP: Multiprocessor System Detected= : 4 CPUs=0A...=0A=0A> If you're interested how this is done in the source, = see=0A> the=0A> function cpu_hlt_setup() in=0A> src/sys/amd64/amd64/mp_mach= dep.c=0A> or src/sys/i386/i386/mp_machdep.c, respectively.=0A> =0A=0A=0A=0A= =0A=0A=0A
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