Re: cannot compile sched_ule without options SMP

On Saturday 02 May 2009 03:50 am, pluknet wrote:
> 2009/5/2 Jung-uk Kim <jkim_at_freebsd.org>:
> > On Thursday 30 April 2009 11:04 pm, pluknet wrote:
> >> 2009/5/1 pluknet <pluknet_at_gmail.com>:
> >> > 2009/5/1 Jeff Roberson <jroberson_at_jroberson.net>:
> >> >> On Thu, 30 Apr 2009, pluknet wrote:
> >> >>> 2009/4/30 Jeff Roberson <jroberson_at_jroberson.net>:
> >> >>>> On SMP machines you should now see output like this:
> >> >>>> FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
> >> >>>> FreeBSD/SMP: 1 package(s) x 4 core(s) x 2 SMT threads
> >> >>>>
> >> >>>> If you detect any irregularities with
> >> >>>> kern.sched.topology_spec or this dmesg
> >> >>>> line please report them.
> >> >>>
> >> >>> Hi, Jeff.
> >> >>>
> >> >>> I have such mismatch. This is an Intel E7200.
> >> >>>
> >> >>> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
> >> >>> FreeBSD/SMP: 1 package(s) x 1 core(s) x 2 HTT threads
> >> >>> cpu0 (BSP): APIC ID:  0
> >> >>> cpu1 (AP/HT): APIC ID:  1
> >> >>>
> >> >>> So it should be instead: 1 package(s) x 2 core(s)
> >> >>> cpu0 (BSP): APIC ID:  0
> >> >>> cpu1 (AP): APIC ID:  1
> >> >>
> >> >> Can you please repeat the following steps as I have done
> >> >> here:
> >> >
> >> > (kgdb) p/x cpu_high
> >> > $1 = 0x2
> >> > (kgdb) p/x cpu_cores
> >> > $2 = 0x1
> >> > (kgdb) p/x cpu_logical
> >> > $3 = 0x2
> >> > (kgdb) p/x cpu_feature
> >> > $4 = 0xbfebfbff
> >> > (kgdb) p/x logical_cpus
> >> > $5 = 0x2
> >> > (kgdb) p/x hyperthreading_cpus
> >> > $6 = 0x2
> >>
> >> Follow up myself:
> >>
> >> What is embarrassing me is HTT feature enabled. May the reason
> >> be in a buggy CPUID ?
> >
> > No, the flag does not mean it supports Hyperthreading.  It means
> > more than one logical core is supported (multi-threading)
> > although the name didn't change for historical reason. ;-)
>
> I see now.
>
> > Can you try the attached patch?
>
> Nice, it works!

Committed slightly different version.

http://svn.freebsd.org/viewvc/base?view=revision&revision=191788

Thanks!

Jung-uk Kim