Hi.
I'm on gentoo.
I use powernow-k8 since a long time now...
since I switched to 2.6.30, p-k8 works randomly : everything sounds good
except
some times, I got max frequency = min frequency...
here some more details :
kernel config :
CONFIG_X86_ACPI_CPUFREQ=y
CONFIG_X86_POWERNOW_K8=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_TABLE=y
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
dmesg | grep powernow :
[ 0.721303] powernow-k8: Found 1 AMD Turion(tm) 64 X2 Mobile Technology
TL-58 processors (2 cpu cores) (version 2.20.00)
[ 0.721549] powernow-k8: 0 : fid 0xb (1900 MHz), vid 0x12
[ 0.721635] powernow-k8: 1 : fid 0xa (1800 MHz), vid 0x13
[ 0.721719] powernow-k8: 2 : fid 0x8 (1600 MHz), vid 0x14
[ 0.721804] powernow-k8: 3 : fid 0x0 (800 MHz), vid 0x1e
as you can see, different freqs are correctly detected, but
cpufreq-info :
cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@xxxxxxxxxxxxxxx, please.
analyzing CPU 0:
driver: powernow-k8
CPUs which need to switch frequency at the same time: 0 1
hardware limits: 800 MHz - 1.90 GHz
available frequency steps: 1.90 GHz, 1.80 GHz, 1.60 GHz, 800 MHz
available cpufreq governors: ondemand, performance
current policy: frequency should be within 800 MHz and 800 MHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 800 MHz (asserted by call to hardware).
analyzing CPU 1:
driver: powernow-k8
CPUs which need to switch frequency at the same time: 0 1
hardware limits: 800 MHz - 1.90 GHz
available frequency steps: 1.90 GHz, 1.80 GHz, 1.60 GHz, 800 MHz
available cpufreq governors: ondemand, performance
current policy: frequency should be within 800 MHz and 800 MHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 800 MHz (asserted by call to hardware).
look on "current policy" line for both processors, even if different freqs
are
detected, governor policy is wrong.
for i in /sys/devices/system/cpu/cpu0/cpufreq/*; do echo $i; cat $i; done;
/sys/devices/system/cpu/cpu0/cpufreq/affected_cpus
0 1
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
800000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
1900000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
800000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency
109000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand
cat: /sys/devices/system/cpu/cpu0/cpufreq/ondemand: Is a directory
/sys/devices/system/cpu/cpu0/cpufreq/related_cpus
0 1
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
1900000 1800000 1600000 800000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
ondemand performance
/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
800000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
powernow-k8
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ondemand
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
800000 <--- here is the pb
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
800000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
<unsupported>
and
for i in /sys/devices/system/cpu/cpu0/cpufreq/ondemand/*;do echo $i;cat
$i;done;
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/ignore_nice_load
0
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/powersave_bias
0
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate
109000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_max
54500000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_min
54500
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/up_threshold
95
as you can see, /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq is the
problem. should be 1900000
ls -l /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq gives 644 and
root:root
echo "1900000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
gives no
error but does nothing
cpufreq-set -u 1900000 gives no error but does nothing either.
cpufreq-set -g ondemand/performance changes governor, but not
scaling_max_freq
so to sum up, randomly, sometimes during boot, scaling_max_freq is set
wrongly
(=scaling_min_freq), and I can't find a way to change it ...
I have even try to compile gov_ondemand as a module, and set performance as
default. loading cpufreq_ondemand module gives :
CPUFREQ: ondemand sampling_rate_max sysfs file is deprecated - used by: cat
CPUFREQ: ondemand sampling_rate_min sysfs file is deprecated - used by: cat
but no futher progress...
I read somewhere that compiling kernel with
CONFIG_X86_ACPI_CPUFREQ=y
CONFIG_X86_POWERNOW_K8=m
helped some folks. I will try it now.
the biggest pb is that it happens randomly. let's say once out of 3 boots...
pierre
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