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P-III Oddity.

DISCUSSION Trevor Hemsley 2 participants 2 messages Apr 7, 2001 – Apr 8, 2001

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Trevor Hemsley

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Quoted 7 lines · Dave Jones
Quoted 2 lines · Rogier Wolff

One machine regularly crashes.
Linux version 2.2.16-3 ([email protected]) (gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)) #1 Mon Jun 19 19:11:44 EDT 2000

Probably unrelated to the issue below. Try a more recent 2.2 ?

Quoted 7 lines
Quoted 1 line

cpuid level : 2

CPU serial number disabled.

Quoted 1 line

cpuid level : 3

CPU serial number enabled.

I've got this on my dual processor P-III 600MHz. One of the cpus in this box reports cpuid level 2, the other 3. Serial number is disabled in the BIOS.

Quoted 5 lines

You should be able to confirm this with my x86info tool. ftp://ftp.suse.com/pub/people/davej/x86info/x86info-1.0.tgz

If this isn't the case, can you send me the output of x86info -a on both CPUs ?

x86info v1.0. Dave Jones 2001
Feedback to <[email protected]>.

Found 2 CPU
seax in: 0, eax = 00000002 ebx = 756e6547 ecx = 6c65746e edx = 49656e69
eax in: 1, eax = 00000673 ebx = 00000000 ecx = 00000000 edx = 0383fbff eax in: 2, eax = 03020101 ebx = 00000000 ecx = 00000000 edx = 0c040843 Vendor ID: "GenuineIntel"; Max CPUID level 2

Intel-specific functions
Family: 6 Model: 7 Type 0 [Pentium III/Pentium III Xeon Original OEM]
Stepping: 3
Reserved: 0

Feature flags 0383fbff:

FPU    Floating Point Unit
VME    Virtual 8086 Mode Enhancements
DE     Debugging Extensions
PSE    Page Size Extensions
TSC    Time Stamp Counter
MSR    Model Specific Registers
PAE    Physical Address Extension
MCE    Machine Check Exception
CX8    COMPXCHG8B Instruction
APIC   On-chip Advanced Programmable Interrupt Controller present and 
enabled
SEP    Fast System Call
MTRR   Memory Type Range Registers
PGE    PTE Global Flag
MCA    Machine Check Architecture
CMOV   Conditional Move and Compare Instructions
FGPAT  Page Attribute Table
PSE-36 36-bit Page Size Extension
MMX    MMX instruction set
FXSR   Fast FP/MMX Streaming SIMD Extensions save/restore
XMM    Streaming SIMD Extensions instruction set

Instruction TLB: 4KB pages, 4-way set assoc, 32 entries Instruction TLB: 4MB pages, fully assoc, 2 entries
Data TLB: 4KB pages, 4-way set assoc, 64 entries
L2 unified cache: 512KB, 4-way set assoc, 32 byte line size Instruction cache: 16KB, 4-way set assoc, 32 byte line size Data TLB: 4MB pages, 4-way set assoc, 8 entries
Data cache: 16KB, 2-way or 4-way set assoc, 32 byte line size eax in: 0, eax = 00000002 ebx = 756e6547 ecx = 6c65746e edx = 49656e69 eax in: 1, eax = 00000673 ebx = 00000000 ecx = 00000000 edx = 0383fbff eax in: 2, eax = 03020101 ebx = 00000000 ecx = 00000000 edx = 0c040843 Vendor ID: "GenuineIntel"; Max CPUID level 2

Intel-specific functions
Family: 6 Model: 7 Type 0 [Pentium III/Pentium III Xeon Original OEM]
Stepping: 3
Reserved: 0

Feature flags 0383fbff:

FPU    Floating Point Unit
VME    Virtual 8086 Mode Enhancements
DE     Debugging Extensions
PSE    Page Size Extensions
TSC    Time Stamp Counter
MSR    Model Specific Registers
PAE    Physical Address Extension
MCE    Machine Check Exception
CX8    COMPXCHG8B Instruction
APIC   On-chip Advanced Programmable Interrupt Controller present and 
enabled
SEP    Fast System Call
MTRR   Memory Type Range Registers
PGE    PTE Global Flag
MCA    Machine Check Architecture
CMOV   Conditional Move and Compare Instructions
FGPAT  Page Attribute Table
PSE-36 36-bit Page Size Extension
MMX    MMX instruction set
FXSR   Fast FP/MMX Streaming SIMD Extensions save/restore
XMM    Streaming SIMD Extensions instruction set

Instruction TLB: 4KB pages, 4-way set assoc, 32 entries Instruction TLB: 4MB pages, fully assoc, 2 entries Data TLB: 4KB pages, 4-way set assoc, 64 entries
L2 unified cache: 512KB, 4-way set assoc, 32 byte line size Instruction cache: 16KB, 4-way set assoc, 32 byte line size Data TLB: 4MB pages, 4-way set assoc, 8 entries Data cache: 16KB, 2-way or 4-way set assoc, 32 byte line size

/proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 7
model name : Pentium III (Katmai)
stepping : 3
cpu MHz : 598.407
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 mmx fxsr sse
bogomips : 1192.75

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 7
model name : Pentium III (Katmai)
stepping : 3
cpu MHz : 598.407
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 3
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 mmx fxsr sse
bogomips : 1196.03

Signature · 2 lines
Trevor Hemsley, Brighton, UK.
[email protected]
#1 lore raw
Quoted 3 lines · Trevor Hemsley

I've got this on my dual processor P-III 600MHz. One of the cpus in this box reports cpuid level 2, the other 3. Serial number is disabled in the BIOS.

Interesting, the cpu serial number isn't being disabled on the 2nd CPU. Most odd. Well, we disable reporting that it's available, but it looks like it still remains possible to get at it.

I'll dig some more tomorrow morning.

Dave.