sysfs cpufreq missing in 2.6.0

sysfs cpufreq missing in 2.6.0

[Nirmal Govind]

Hi,

I compiled the 2.6.0 kernel (released on Dec. 18, downloaded from 
kernel.org) with the options enabled for userspace cpufreq.. the 
documentation says that sysfs will be used however I do not have any 
such device in /proc/sys/ or in /. I enabled the /proc/cpufreq so I 
do see a /proc/cpufreq but nothing similar to 
/sys/devices/system/cpu/cpu0/cpufreq/ as mentioned in the kernel 
documentation which also says that the sysfs devices will be created 
automatically. Here's what my /proc/sys/ looks like:

root@variance:~# ls /proc/sys
abi/  debug/  dev/  fs/  kernel/  net/  proc/  sunrpc/  vm/

Below is the relevant config options in the kernel (the default on 
boot is set to userspace). Please let me know if I'm missing 
something and if there's some way to get the cpufreq working with sysfs.

Thanks,
nirmal

--

#
# CPU Frequency scaling
#
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_PROC_INTF=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_CPU_FREQ_GOV_USERSPACE=y
# CONFIG_CPU_FREQ_24_API is not set
CONFIG_CPU_FREQ_TABLE=y

#
# CPUFreq processor drivers
#
# CONFIG_X86_ACPI_CPUFREQ is not set
# CONFIG_X86_POWERNOW_K6 is not set
# CONFIG_X86_POWERNOW_K7 is not set
# CONFIG_X86_POWERNOW_K8 is not set
# CONFIG_X86_GX_SUSPMOD is not set
CONFIG_X86_SPEEDSTEP_CENTRINO=y
# CONFIG_X86_SPEEDSTEP_ICH is not set
# CONFIG_X86_SPEEDSTEP_SMI is not set
# CONFIG_X86_P4_CLOCKMOD is not set
# CONFIG_X86_LONGRUN is not set
# CONFIG_X86_LONGHAUL is not set

Re: sysfs cpufreq missing in 2.6.0

[Mattia Dongili]

On Tue, Dec 23, 2003 at 11:38:08AM -0500, Nirmal Govind wrote:
> Hi,
> 
> I compiled the 2.6.0 kernel (released on Dec. 18, downloaded from 
> kernel.org) with the options enabled for userspace cpufreq.. the 
> documentation says that sysfs will be used however I do not have any 
> such device in /proc/sys/ or in /. I enabled the /proc/cpufreq so I 
> do see a /proc/cpufreq but nothing similar to 

sysfs is not procfs :)
take look at Documentation/filesystems/sysfs.txt in your kernel tree

bye
-- 
mattia
:wq!

Re: sysfs cpufreq missing in 2.6.0

[Nirmal Govind]

> sysfs is not procfs :)
> take look at Documentation/filesystems/sysfs.txt in your kernel tree
> 
> bye

Aah.. thank you! Read it and also found the cpufreq after I mounted 
sysfs. I changed the frequency too - one question: how does one know 
if it's actually working? I see the new frequency in the 
scaling_setspeed file but are there any user tools that show the 
real-time frequency of the processor?

Thanks,
nirmal

Re: sysfs cpufreq missing in 2.6.0

[AthlonRob]

On Tue, 2003-12-23 at 09:01, Nirmal Govind wrote:

> Aah.. thank you! Read it and also found the cpufreq after I mounted 
> sysfs. I changed the frequency too - one question: how does one know 
> if it's actually working? I see the new frequency in the 
> scaling_setspeed file but are there any user tools that show the 
> real-time frequency of the processor?

cat /proc/cpuinfo ....

Re: sysfs cpufreq missing in 2.6.0

[Nirmal Govind]

> cat /proc/cpuinfo ....
> 
> 

Yes, I tried that but that still shows the original frequency. So 
here's what my scaling_setspeed looks like:

root@variance:/# more 
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
800000

And here's my /proc/cpuinfo:

root@variance:/usr/src/linux-2.6.0# more /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 9
model name      : Intel(R) Pentium(R) M processor 1400MHz
stepping        : 5
cpu MHz         : 1400.280
cache size      : 1024 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 mce cx8 apic sep mtrr pge 
mca cmov pat
clflush dts acpi mmx fxsr sse sse2 tm pbe tm2 est
bogomips        : 1493.28

I don't see an 800 here.. I'm pretty sure the frequency has been 
scaled down since my fan doesn't come on that often now.. or could 
it be that the machine is fooled into thinking that the freq. is 800 
(and hence the reduced fan activity) but it's still actually at 
1400? That would be scary and might result in failures I guess...

Thanks,
nirmal

Re: sysfs cpufreq missing in 2.6.0

[Ducrot Bruno]

On Tue, Dec 23, 2003 at 09:54:24AM -0800, AthlonRob wrote:
> On Tue, 2003-12-23 at 09:01, Nirmal Govind wrote:
> 
> > Aah.. thank you! Read it and also found the cpufreq after I mounted 
> > sysfs. I changed the frequency too - one question: how does one know 
> > if it's actually working? I see the new frequency in the 
> > scaling_setspeed file but are there any user tools that show the 
> > real-time frequency of the processor?
> 
> cat /proc/cpuinfo ....
> 

No.  /proc/cpuinfo will only show what 'think' cpufreq internals.
Use bogomips instead for example, or eventually x86info.

-- 
Ducrot Bruno

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.

Re: sysfs cpufreq missing in 2.6.0

[Jan De Luyck]

On Tuesday 23 December 2003 17:38, Nirmal Govind wrote:
> Hi,
>
> I compiled the 2.6.0 kernel (released on Dec. 18, downloaded from
> kernel.org) with the options enabled for userspace cpufreq.. the
> documentation says that sysfs will be used however I do not have any
> such device in /proc/sys/ or in /. I enabled the /proc/cpufreq so I
> do see a /proc/cpufreq but nothing similar to
> /sys/devices/system/cpu/cpu0/cpufreq/ as mentioned in the kernel
> documentation which also says that the sysfs devices will be created
> automatically. Here's what my /proc/sys/ looks like:

You have to mount the sysfs in /sys. Create the /sys directory with mkdir, and 
add this to your /etc/fstab

sysfs           /sys            sysfs           defaults         0    0

and run  a mount -a. Then you'll have the new sysfs system mounted.

Hope this helps.

Jan
-- 
An eye in a blue face
Saw an eye in a green face.
"That eye is like this eye"
Said the first eye,
"But in low place,
Not in high place."