Cpu Scaling - save energy...

[michaelvv]

Hi Forum.

Is it possible to use some kind of cpu scaling software , i have a Intel Core 2 Duo ,
and i know from my WATT-meter that if i can lower it to 2Ghz i can save energy.

I'm coming from centos , where it works out of the box....

Info -

proxmox:/# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU E8200 @ 2.66GHz
stepping : 6
cpu MHz : 2666.360
cache size : 6144 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 lahf_lm
bogomips : 5336.57
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU E8200 @ 2.66GHz
stepping : 6
cpu MHz : 2666.360
cache size : 6144 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nxlm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 lahf_lm
bogomips : 5332.71
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

Thanks in advance..

/Michael

 

[dietmar]

I am not sure, but maybe cpufreqd can do that.

# apt-get install cpufreqd

But you need to configure it manually (see 'man cpufreqd')

Please tell me if that works.

- Dietmar

 

[mangoo]

I am not sure, but maybe cpufreqd can do that.

# apt-get install cpufreqd

But you need to configure it manually (see 'man cpufreqd')

Please tell me if that works.

- Dietmar

cpufreq should work fine with KVM, but on Proxmox it won't work reliably on some CPUs - i.e. those which don't have constant_tsc flag.
On such CPUs, cpufreq will only work reliably with kvm-84 and later.

There is also one catch here: if host's CPU frequency was low and a guest was started, /proc/cpuinfo on the guest will show lowered frequency value, even if in reality CPU may be working faster. It doesn't have any influence on performance though.

 

[michaelvv]

Hi Again.

I have done the following , but i have no success so far.

apt-get install cpufreqd

it also installed this package libcpufreq0

altered /etc/cpufreqd.conf - see below

according to this documentation http://linux.die.net/man/5/cpufreqd.conf

it seems to me that i should alter these lines under General , mayby i'm wrong.

when i try to start cpufreqd

/etc/init.d/cpufreqd start

it fails : Starting CPU Frequency daemon: cpufreqd failed!

cat /proc/acpi/processor/CPU0/info - says

processor id: 0
acpi id: 1
bus mastering control: yes
power management: no
throttling control: yes
limit interface: yes

On a ubuntu 9.04 , with a Core 2 Duo processor it works fine and as i can see

power management : yes ....

I have intel Speedsteep enabled in the BIOS , just double checked it....

I'm Lost...

/Michael







_______________________________________
# this is a comment
# see CPUFREQD.CONF(5) manpage for a complete reference
#
# Note: ondemand/conservative Profiles are disabled because
# they are not available on many platforms.

[General]
pidfile=/var/run/cpufreqd.pid
poll_interval=2
pm_type=acpi
acpi_workaround=1
verbosity=4
enable_remote=1
remote_group=root
[/General]

[acpi]
acpid_socket=/var/run/acpid.socket
[/acpi]

#[nforce2_atxp1]
#vcore_path=/some/path
#vcore_default=1500
#[/nforce2_atxp1]

#[sensors_plugin]
#sensors_conf=/some/file
#[/sensors_plugin]

[Profile]
name=On Demand High
minfreq=40%
maxfreq=100%
policy=ondemand
[/Profile]
#
[Profile]
name=On Demand Low
minfreq=20%
maxfreq=80%
policy=ondemand
[/Profile]

[Profile]
name=Performance High
minfreq=100%
maxfreq=100%
policy=performance
#exec_post=echo 8 > /proc/acpi/sony/brightness
[/Profile]

[Profile]
name=Performance Low
minfreq=80%
maxfreq=80%
policy=performance
[/Profile]

[Profile]
name=Powersave High
minfreq=60%
maxfreq=60%
policy=powersave
[/Profile]

[Profile]
name=Powersave Low
minfreq=40%
maxfreq=40%
policy=powersave
[/Profile]

#[Profile]
#name=Conservative High
#minfreq=33%
#maxfreq=100%
#policy=conservative
#[/Profile]
#
#[Profile]
#name=Conservative Low
#minfreq=0%
#maxfreq=66%
#policy=conservative
#[/Profile]

##
# Basic states
##
# when AC use performance mode
[Rule]
name=AC Rule
ac=on # (on/off)
profile=Performance High
[/Rule]

# stay in performance mode for the first minutes
[Rule]
name=AC Off - High Power
ac=off # (on/off)
battery_interval=70-100
#exec_post=echo 5 > /proc/acpi/sony/brightness
profile=Performance Low
[/Rule]

# conservative mode when not AC
[Rule]
name=AC Off - Medium Battery
ac=off # (on/off)
battery_interval=30-70
#exec_post=echo 3 > /proc/acpi/sony/brightness
profile=Powersave High
[/Rule]

# conservative mode when not AC
[Rule]
name=AC Off - Low Battery
ac=off # (on/off)
battery_interval=0-30
#exec_post=echo 3 > /proc/acpi/sony/brightness
profile=Powersave Low
[/Rule]

##
# Special Rules
##
# CPU Too hot!
[Rule]
name=CPU Too Hot
acpi_temperature=55-100
cpu_interval=50-100
profile=Performance Low
[/Rule]

# use performance mode if I'm watching a movie
# I don't care for batteries!
# But don't heat too much.
[Rule]
name=Movie Watcher
programs=xine,mplayer,gmplayer
battery_interval=0-100
acpi_temperature=0-60
cpu_interval=0-100
profile=Performance High
[/Rule]
___________________________________________________-

 

[michaelvv]

I got it to work this way..

Hi Again.

I have done the following...

apt-get install powernowd

when it starts it complains about some missing sysfs

so i have added this modules to

/etc/modules

acpi_cpufreq

the i restarted powernowd

/etc/init.d/powernowd restart

i just checked and after a reboot it fine scales my cpu to 1998 Mhz....

__________________________________________-
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU E8200 @ 2.66GHz
stepping : 6
cpu MHz : 1998.000
cache size : 6144 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nxlm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 lahf_lm
bogomips : 5336.56
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU E8200 @ 2.66GHz
stepping : 6
cpu MHz : 1998.000
cache size : 6144 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nxlm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 lahf_lm
bogomips : 5332.71
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:


/Michael