-ac6 mis-reports cpu clock

-ac6 mis-reports cpu clock

[bradley mclain]

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here is an extract from dmesg from 2.4.2 and -ac6,
showing a disparity in cpu clock speed..

-ac6 has inserted a line claiming my clock is 400Mhz
(it is actually 533 -- and i believe my fsb is 133).

i don't think i compiled these two radically
differently.  what could i have done wrong to cause
this?  or has -ac6 introduced a bug of some sort?

any suggestions for debugging or additional
information?

thanks,
bradley mclain

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Re: -ac6 mis-reports cpu clock

[Alan Cox]

> here is an extract from dmesg from 2.4.2 and -ac6,
> showing a disparity in cpu clock speed..
> 
> -ac6 has inserted a line claiming my clock is 400Mhz
> (it is actually 533 -- and i believe my fsb is 133).
> 
> i don't think i compiled these two radically
> differently.  what could i have done wrong to cause
> this?  or has -ac6 introduced a bug of some sort?

ac6 reads the clock speed data from the CPU and also compares it with the
running clock speed. So it thinks you have a chip intended for a 100Mhz
bus. (multiplier 4 FSB 100).

There are two possible causes for that result

#1	You are running a 400/100 component at 533/133
#2	The bus clock tables for intel are subtly different to the ones
	we've managed to deduce so far (Its not properly documented)

Alan

Re: -ac6 mis-reports cpu clock

[Sergey Kubushin]

On Tue, 27 Feb 2001, bradley mclain wrote:

Another oddity with ac6 (look for those 65+ GHz):

=== Cut ===
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 5
model name	: Pentium II (Deschutes) (65044Mhz/65413Mhz FSB)
stepping	: 2
cpu MHz		: 400.917
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
bogomips	: 799.53

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 5
model name	: Pentium II (Deschutes) (65044Mhz/65413Mhz FSB)
stepping	: 2
cpu MHz		: 400.917
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
bogomips	: 801.17
=== Cut ===

> here is an extract from dmesg from 2.4.2 and -ac6,
> showing a disparity in cpu clock speed..
>
> -ac6 has inserted a line claiming my clock is 400Mhz
> (it is actually 533 -- and i believe my fsb is 133).
>
> i don't think i compiled these two radically
> differently.  what could i have done wrong to cause
> this?  or has -ac6 introduced a bug of some sort?
>
> any suggestions for debugging or additional
> information?
>
> thanks,
> bradley mclain
>
> __________________________________________________
> Do You Yahoo!?
> Get email at your own domain with Yahoo! Mail.
> http://personal.mail.yahoo.com/

---
Sergey Kubushin				Sr. Unix Administrator
CyberBills, Inc.			Phone:	702-567-8857
874 American Pacific Dr,		Fax:	702-567-8808
Henderson, NV, 89014