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P-III Oddity.

DISCUSSION Rogier Wolff 3 participants 3 messages Apr 7, 2001 – Apr 8, 2001

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Rogier Wolff

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#0 lore raw

Hi,

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
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 7
model name : Pentium III (Katmai)
stepping : 3
cpu MHz : 551.255
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
sep_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 sep mtrr pge mca cmov pat pse36 mmx fxsr xmm
bogomips : 1101.00

Another one, I don't really know, but I was comparing /proc/cpuinfo on these two machines as they are supposed to have the same CPU:

/home/wolff> cat /proc/version /proc/cpuinfo
Linux version 2.4.3 (wolff@cave) (gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)) #52 Fri Apr 6 14:43:38 MEST 2001
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 7
model name : Pentium III (Katmai)
stepping : 3
cpu MHz : 551.263
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 sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips : 1101.00

/home/wolff>

Everything is exactly the same, except for the "cpuid level". Once the cpu family and model are the same, I'd expect the cpuid level to be the same too. In this case even the stepping is the same, so how can the cpuid level differ?

Maybe this is a reporting difference between 2.4.3 and 2.2.16????

Anybody care to shed some light on this?

Roger.

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#1 lore raw
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 1 line

cpuid level : 2

CPU serial number disabled.

Quoted 1 line

cpuid level : 3

CPU serial number enabled.

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 ?

Note, that 2.4 should be disabling the serial number by default.
(Unless you booted with the `serialnumber' bootarg.)

regards,

Dave.

#2 lore raw
In reply to Rogier Wolff
Quoted 6 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 ?

2.2.19pre16 here. I don't have an SMP kernel but is this right:

cpuid level : 3
Vendor ID: "GenuineIntel"; Max CPUID level 2

That line is the only line I could find that mentioned cpuid in your code so I seem to be getting two different answers...

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