Re: only one logical CPU used in Xeon
John Baldwin <[email protected]> Thu, 12 Mar 2009 08:44:13 -0400
| Newsgroups | gmane.os.freebsd.devel.smp |
|---|---|
| Message-ID | <[email protected]> |
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 _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-smp To unsubscribe, send any mail to "[email protected]"