FreeBSD 8.0, Intel Xeon E5530, Dell R410, only 2 cores available

[John Baldwin]

On Monday 01 February 2010 11:14:28 am Hoang V.D. | Creative Solutions GmbH wrote:
> Hello
> 
> > -----Original Message-----
> > From: John Baldwin [mailto:jhb at freebsd.org]
> > Sent: Monday, February 01, 2010 3:32 PM
> > To: freebsd-hardware at freebsd.org
> > Cc: Hoang V.D. | Creative Solutions GmbH
> > Subject: Re: FreeBSD 8.0, Intel Xeon E5530, Dell R410, only 2 cores available
> >
> > Can you get the output of 'acpidump -t'?  Also, the 'x 2 cores x 2 SMT
> > threads' bit is based on registers read from the CPU.  It is really claiming
> > to be a 2x2 chip (2 cores with 2 threads each).  Maybe see what
> > /usr/ports/misc/cpuid claims?
> >
> 
> This is the output of 'acpidump -t':
> 
> =========================
> 
> It looks like all CPU above 4 are marked as "Disabled". Do "CPUs" here
> mean real cores or SMT cores?

Yes, they are disabled in both the APIC and SRAT (NUMA info) tables.  CPUs
here mean SMT threads.  Effectively each logical CPU that is visible to the
OS should be listed in the ACPI APIC table.

> Here is the output of cpuid:
> 
> =========================

Grr, it looks like cpuid hasn't been updated to parse the cpuid bits that
tell you how many threads and cores there are for a single package, but I
suspect it would tell you the same thing that FreeBSD is claiming.  What
does your BIOS say about the number of cores in your CPU?

-- 
John Baldwin