CPU Model IDs(string) inconsistant on SMP AMD System (2.4.18-rc4)

I am working with several SMP Athlon machines, and they are all reporting the first CPUs model ID(*** called 'model name' in /proc/cpuinfo) as 'AMD Athlon(tm) MP 1800+' and the second CPUs model ID as 'AMD Athlon(tm) Processor'.

From looking at the code it seems that the model IDs are obtained using cpuid calls. Does anyone have insight into this?

Some Info:
Motherboard: Tyan S2462NG
CPUs: 2 Athlon MP 1800+
Kernel Version: 2.4.18-rc4

Adam Scislowicz
Soft. Engineer
Fourelle Systems, Inc.
P.S: Please CC me in response.

*** Extra Info ***
---------------------------------------------
- bash-2.04# cat /proc/cpuinfo -
--------------------------------
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 6
model name : AMD Athlon(tm) MP 1800+
stepping : 2
cpu MHz : 1526.541
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips : 3047.42

processor : 1
vendor_id : AuthenticAMD
cpu family : 6
model : 6
model name : AMD Athlon(tm) Processor
stepping : 2
cpu MHz : 1526.541
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips : 3047.42

-----------------------
- bash-2.04# dmesg -
--------------------
Linux version 2.4.18-rc4 ([email protected]) (gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-85)) #6 SMP Mon Mar 18 12:04:07 PST 2002 BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e4800 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 0000000040000000 (usable)
BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved)
128MB HIGHMEM available.
found SMP MP-table at 000f74d0
hm, page 000f7000 reserved twice.
hm, page 000f8000 reserved twice.
hm, page 0009f000 reserved twice.
hm, page 000a0000 reserved twice.
On node 0 totalpages: 262144
zone(0): 4096 pages.
zone(1): 225280 pages.
zone(2): 32768 pages.
Intel MultiProcessor Specification v1.4
Virtual Wire compatibility mode.
OEM ID: TYAN Product ID: GUINNESS APIC at: 0xFEE00000
Processor #1 Pentium(tm) Pro APIC version 16
Processor #0 Pentium(tm) Pro APIC version 16
I/O APIC #2 Version 17 at 0xFEC00000.
Processors: 2
Kernel command line: root=/dev/rd/0 rd_size=98304 mem=1048576K
Initializing CPU#0
Detected 1526.541 MHz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 3047.42 BogoMIPS
Memory: 1005116k/1048576k available (1236k kernel code, 43072k reserved, 340k data, 228k init, 131072k highmem) Dentry-cache hash table entries: 131072 (order: 8, 1048576 bytes)
Inode-cache hash table entries: 65536 (order: 7, 524288 bytes)
Mount-cache hash table entries: 16384 (order: 5, 131072 bytes)
Buffer-cache hash table entries: 65536 (order: 6, 262144 bytes)
Page-cache hash table entries: 262144 (order: 8, 1048576 bytes)
CPU: Before vendor init, caps: 0383fbff c1cbfbff 00000000, vendor = 2
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 256K (64 bytes/line)
CPU: After vendor init, caps: 0383fbff c1cbfbff 00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.

CPU:     After generic, caps: 0383fbff c1cbfbff 00000000 00000000
CPU:             Common caps: 0383fbff c1cbfbff 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 ([email protected])
mtrr: detected mtrr type: Intel
CPU: Before vendor init, caps: 0383fbff c1cbfbff 00000000, vendor = 2
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 256K (64 bytes/line)
CPU: After vendor init, caps: 0383fbff c1cbfbff 00000000 00000000 Intel machine check reporting enabled on CPU#0.

CPU:     After generic, caps: 0383fbff c1cbfbff 00000000 00000000
CPU:             Common caps: 0383fbff c1cbfbff 00000000 00000000
CPU0: AMD Athlon(tm) MP 1800+ stepping 02
per-CPU timeslice cutoff: 731.31 usecs.

enabled ExtINT on CPU#0
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Booting processor 1/0 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... 3047.42 BogoMIPS
CPU: Before vendor init, caps: 0383fbff c1cbfbff 00000000, vendor = 2
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 256K (64 bytes/line)
CPU: After vendor init, caps: 0383fbff c1cbfbff 00000000 00000000 Intel machine check reporting enabled on CPU#1.

CPU:     After generic, caps: 0383fbff c1cbfbff 00000000 00000000
CPU:             Common caps: 0383fbff c1cbfbff 00000000 00000000
CPU1: AMD Athlon(tm) Processor stepping 02

Total of 2 processors activated (6094.84 BogoMIPS).
...

Hello,

The same thing is happening on our Tyan S2460 motherboards, running 2.4.19-pre4-ac2. IIRC it is the BIOS that sets these strings. Maybe it is fixed in the latest BIOS update ? (I have not been brave enough to upgrade them)

Regards,

Maarten Ballintijn.

It means your BIOS vendor can't read specifications.

'AMD Athlon(tm) Processor'. is the power-on default.
On working out if the CPU is an XP or an MP (by reading the MP bit in cpu capabilities flags) it's supposed to set the name string. Crap BIOSen only do this for the first CPU.

It's harmless, but I'll get around to writing a boot time fixup sometime.

| Dave Jones.        http://www.codemonkey.org.uk
| SuSE Labs