Re: Problem with cpufreq on Geode GX1

[Jose Miguel Goncalves]

Hi Hiroshi,

Here goes the extra info that you asked for:

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
performance
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
300759
$ cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
300759
$ echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
powersave
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
23042
$ cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
23042

One other strange thing that I've noticed is that I'll never get the same
frequency when switching to powersave govenor. It allways gets increased a
little bit. For example:

$ echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
24453
$ echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
27779
$ echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
29947
$ echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
32400

Thanks for checking this.

Jose Goncalves


Hiroshi Miura wrote:
> Hi,
>
> I will check code in several days, but I cannot re-produce a problem in a moment
> because I am away from home for business trip.
>
> In my understand, the driver recognize the CPU properly. 
>
> At Fri, 26 Aug 2005 19:01:37 +0100,
> Jose Miguel Goncalves wrote:
>
> > Hi all,
> >
> > I'm trying to use cpufreq on my Geode GX1 board with linux-2.6.12.5, but,
> > while everything seems OK, i.e., I can change from performance to powersave
> > governor and back and /proc/cpuinfo reports me frequency changes, I can
> > get no effective frequency/CPU power change because I check it with
> > the Whetstone benchmark and it allways give me the same value (~100 MWIPS).
> > Any ideas from were could be the problem?
>
>
> Can you try to check also follows?
>
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
>
> With this driver, it will significantly slow down by setting powersave mode.
> It seems some bus in the driver.
>
> Thank you for report.
>
> Hiroshi
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