Re: only one logical CPU used in Xeon

--- On Thu, 3/12/09, John Baldwin <[email protected]> wrote:=0A> =0A> -----In=
line Attachment Follows-----=0A> =0A> On Wednesday 11 March 2009 11:01:51=
=0A> am Oliver Fromme wrote:=0A> > Here's how you can see the details in th=
e demsg=0A> output:=0A> > The older machine:=0A> > =0A> >=A0 > Features =3D=
 0xbfebfbff <...,HTT,...>=0A> > =0A> > The "HTT" bit in the features bitmas=
k indicates that=0A> the=0A> > processor supports hyperthreading.=0A> =0A> =
No, that flag just means it supports a register where you=0A> can ask for t=
he =0A> total number of threads/cores per package.=A0 Multi-core=0A> CPUs t=
hat don't have =0A> hyperthreads have 'HTT' set, but when you read the=0A> =
registers properly you see =0A> that they have 1 thread per core.=0A> =0A=
=0ADoes this mean that the # of logical CPUs per core is not enough to dete=
rmine whether the machine supports hyperthreading or not? You've said earli=
er that the newer machine is not hyperthreaded, so I'm assuming that there =
is another part in the dmesg output that says so. more guidance pls.=0A=0A=
=0A=0A      

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