[wplug] redhat 8 SMP CPU detection

[Lance Tost]

We got a new Dell PowerEdge 2650 in for a demo pre-installed with RedHat 
8.  It's a 2 CPU box but the funny thing is Linux is reporting 4 CPUs.  
Has anyone seen behavior like this?  You'd think being pre-installed, they 
would have made sure everything was working properly...

I actually did take the cover off to verify only two CPUs (BIOS also 
reports two CPUs).

Here's some CPU info from dmesg:

CPU: L2 cache: 512K
CPU: Physical Processor ID: 0
CPU: After vendor init, caps: bfebfbff 00000000 00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.40 (20010327) Richard Gooch (rgooch at atnf.csiro.au)
mtrr: detected mtrr type: Intel
CPU: Before vendor init, caps: bfebfbff 00000000 00000000, vendor = 0
CPU: L1 I cache: 0K, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 0
CPU: After vendor init, caps: bfebfbff 00000000 00000000 00000000
Intel machine check reporting enabled on CPU#0.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
CPU0: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
per-CPU timeslice cutoff: 1462.54 usecs.
task migration cache decay timeout: 1 msecs.
enabled ExtINT on CPU#0
ESR value before enabling vector: 00000040
ESR value after enabling vector: 00000000
Booting processor 1/1 eip 2000
Initializing CPU#1
masked ExtINT on CPU#1
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Calibrating delay loop... 5573.87 BogoMIPS
CPU: Before vendor init, caps: bfebfbff 00000000 00000000, vendor = 0
CPU: L1 I cache: 0K, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 0
CPU: After vendor init, caps: bfebfbff 00000000 00000000 00000000
Intel machine check reporting enabled on CPU#1.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
CPU1: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
Booting processor 2/2 eip 2000
Initializing CPU#2
masked ExtINT on CPU#2
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Calibrating delay loop... 5573.87 BogoMIPS
CPU: Before vendor init, caps: bfebfbff 00000000 00000000, vendor = 0
CPU: L1 I cache: 0K, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 3
CPU: After vendor init, caps: bfebfbff 00000000 00000000 00000000
Intel machine check reporting enabled on CPU#2.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
CPU2: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
Booting processor 3/3 eip 2000
Initializing CPU#3
masked ExtINT on CPU#3
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Calibrating delay loop... 5573.87 BogoMIPS
CPU: Before vendor init, caps: bfebfbff 00000000 00000000, vendor = 0
CPU: L1 I cache: 0K, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 3
CPU: After vendor init, caps: bfebfbff 00000000 00000000 00000000
Intel machine check reporting enabled on CPU#3.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
CPU3: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
Total of 4 processors activated (22259.09 BogoMIPS).
cpu_sibling_map[0] = 1
cpu_sibling_map[1] = 0
cpu_sibling_map[2] = 3
cpu_sibling_map[3] = 2


-- 
Lance Tost <ltost at pobox.com>