Atlhlon 64, overclocking and cool'n'quiet

[kristjan <kristjan.ugrin@gmail.com>]

Hello!

I've overclocked one workstation with athlon 64 2800+ cpu and I was able  
to get cool'n'quiet working in windows by
manually setting p-states with RMClock utility and i'm trying to achieve  
same thing under linux kernel 2.6.38.

First I've modified DSDT;
multipliers are the same, since I'm not changing those, only FSB  
frequency, which is now 260 Mhz with HT multiplier of 3, that gives:
780 + 2*130 = 1040
780 + 10*130 = 2080

I'm a bit confused though - fid multiplier is different under windows and  
in bios - there it is used x9 which conforms with highest cpu frequency  
reported
by various tools in windows:
2340 Mhz = 260 * 9 (it is actually running at 2342 - this is what various  
tools say)

but I can't get it via traditional formula.
Booting vanilla kernel without modified DSDT will give me only 1  
performance state with locked 2343 Mhz.

However setting highest pss in DSDT  to 2343 (0x0927) as highest will lead  
to non working cool'n'quiet:
----
Mar 30 18:24:02 kriko kernel: [   14.162636] powernow-k8: Found 1 AMD  
Athlon(tm) 64 Processor 2800+ (1 cpu cores) (version 2.20.00)
Mar 30 18:24:02 kriko kernel: [   14.162683] powernow-k8: invalid freq  
entries 1800000 kHz vs. 2343000 kHz
Mar 30 18:24:02 kriko kernel: [   14.162685] powernow-k8: invalid freq  
entries 1000000 kHz vs. 1040000 kHz
Mar 30 18:24:02 kriko kernel: [   14.162691] [Firmware Bug]: powernow-k8:  
invalid powernow_table
----

What the correct frequency this cpu is running if I set fsb to 260 Mhz so  
the cpufreq driver will accept it?

Thanks

-- 
Kristjan Ugrin