Date: Thu, 12 Mar 2009 08:44:13 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-smp@freebsd.org, robert@heron.pl Subject: Re: only one logical CPU used in Xeon Message-ID: <200903120844.13506.jhb@freebsd.org> In-Reply-To: <200903111501.n2BF1pIj016949@lurza.secnetix.de> References: <200903111501.n2BF1pIj016949@lurza.secnetix.de>
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On Wednesday 11 March 2009 11:01:51 am Oliver Fromme wrote: > Here's how you can see the details in the demsg output: > The older machine: > > > Features = 0xbfebfbff <...,HTT,...> > > The "HTT" bit in the features bitmask indicates that the > processor supports hyperthreading. No, that flag just means it supports a register where you can ask for the total number of threads/cores per package. Multi-core CPUs that don't have hyperthreads have 'HTT' set, but when you read the registers properly you see that they have 1 thread per core. -- John Baldwin
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