Intel 3.4 hyperthreading/siblings

anthonyriga torrodimerda at yahoo.com
Fri Feb 4 10:35:34 EST 2005


Dave thanks! By the way where is the kernel sources
kept in Fedora 3? 
--- Dave Andruczyk <djandruczyk at yahoo.com> wrote:

> 
> --- anthonyriga <torrodimerda at yahoo.com> wrote:
> 
> > How do I know if hyperthreading is actually
> working on
> > Fedora 3. I know when it boots it loads the smp
> kernel
> > but when I do  dmesg |grep -i cpu. Its only
> showing 1
> > cpu as up.  Any suggestions?
> > Initializing CPU#0
> > CPU 0 irqstacks, hard=023ce000 soft=023ae000
> > CPU: After generic identify, caps: 1febfbff
> 00000000
> > 00000000 00000000
> > CPU: After vendor identify, caps:  1febfbff
> 00000000
> > 00000000 00000000
> > CPU: Trace cache: 12K uops, L1 D cache: 8K
> > CPU: L2 cache: 512K
> > CPU: Physical Processor ID: 0
> > CPU: After all inits, caps:        1febf3ff
> 00000000
> > 00000000 00000080
> > Intel machine check reporting enabled on CPU#0.
> > CPU0: Intel(R) Pentium(R) 4 CPU 3.40GHz stepping
> 08
> > per-CPU timeslice cutoff: 1462.61 usecs.
> > WARNING: 1 siblings found for CPU0, should be 2
> > Brought up 1 CPUs
> 
> Is your kernel compiled for SMP? and when compiling
> an SMP kernel there's a
> nr+cpus choice,  I always set it to 2x the number of
> cpus (phys or virtual) as
> in some cases my cpu' would be detected as CPU0,
> CPU2 (skipping CPU1) thus when
> nr_cpus was set to 2, my second proc wouldn't be
> detected,  but it would if
> nr_cpus was set to 3 or higher.  Hopefully that bug
> is fixed..
> 
> 
> 
> 
> =====
> Dave J. Andruczyk
> 
> 
> 		
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