Problem with cpufreq on Geode GX1

Problem with cpufreq on Geode GX1

[Jose Miguel Goncalves]

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?

Some additional info follows:

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

performance

$ cat /proc/cpuinfo

processor	: 0
vendor_id	: CyrixInstead
cpu family	: 5
model		: 9
model name	: Geode(TM) Integrated Processor by National Semi
stepping	: 2
cpu MHz		: 300.672
cache size	: 16 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 tsc msr cx8 cmov mmx cxmmx
bogomips	: 591.87

$ echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

$ cat /proc/cpuinfo

processor	: 0
vendor_id	: CyrixInstead
cpu family	: 5
model		: 9
model name	: Geode(TM) Integrated Processor by National Semi
stepping	: 2
cpu MHz		: 37.095
cache size	: 16 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 tsc msr cx8 cmov mmx cxmmx
bogomips	: 73.02

Best regards,
Jose Goncalves

Re: Problem with cpufreq on Geode GX1

[Hiroshi Miura]

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

-- 
Hiroshi Miura  --- miura@da-cha.org, Mobile --- himo@da-cha.org
NTTDATA Corp. OpenSource Software Center. --- miurahr@nttdata.co.jp 
NTTDATA Intellilink Corp. OpenSource Engineering Dev. -- miurahr@intellilink.co.jp
Kobe Institute of Computing Graduate School of IT - Lecturer -- miurahr@kic.ac.jp
Key id=04AB8617 fingerprint=9117 9407 5684 FBF1 4063  15B4 401D D077 04AB 8617

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
>