Speedstepping on server

[smeerbartje]

I know it's not common to have a server CPU running at lower speeds, but since it is a home server, I want to try this and to see what the impact is in power consumption. The output of /etc/cpuinfo is:


rogier@server:~$ more /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU E7300 @ 2.66GHz
stepping : 6
cpu MHz : 1596.000
cache size : 3072 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
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 const
ant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm
bogomips : 5306.81
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 E7300 @ 2.66GHz
stepping : 6
cpu MHz : 1596.000
cache size : 3072 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
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 const
ant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm
bogomips : 5306.75
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

Now how can I see on what frequency my processor is running at? On Ubuntu desktop (running on my laptop) I see that the CPU is automatically slowing down or speeding up; depending on the jobs it's doing. It would be very nice to have the same functionality on my server.

[bacil]

try this


cat /proc/cpuinfo|grep 'cpu MHz' | sed -e 's/.*: //'| sed -e 's/\..../ MHz/' | head -n 1
this will give you cpu speed in exact time of the run

and


cat /proc/cpuinfo|grep 'cpu MHz'



show both cores

[smeerbartje]

My processor is an Intel Core Duo E7300 (http://processorfinder.intel.com/details.aspx?sSpec=SLAPB). Does this mean it is not running at it's full speed at the moment? CPUINFO shows a speed of 1596.000 Mhz, while the intel website shows 2.66 GHz.

[dragos2]

My processor is an Intel Core Duo E7300 (http://processorfinder.intel.com/details.aspx?sSpec=SLAPB). Does this mean it is not running at it's full speed at the moment? CPUINFO shows a speed of 1596.000 Mhz, while the intel website shows 2.66 GHz.

It has smart power control build into it, you can try to disable it from the bios - if your
bios supports it.

[bacil]

yup .. my laptop is 1600 atom and is running 800 most of the time

you may try to get cpudyn for your server and acpid

sudo apt-get install cpudyn
and
sudo apt-get install acpid

cpudyn -is deamon for dynamicalichanging cpu speed and acpid takes care of powering it :-)

[smeerbartje]

Okay, I have installed cpudyn; but when I type: cpudynd, it says:


cpydynd version 1.0 Copyright: Ricardo Galli <gallir@uib.es>
cpydynd: CPU frequency control disables
Error: Nothing to do, exiting

What to do next?

[bacil]

does it really say cpydynd ?

man cpudyn

check if you have these modules
acpi_cpufreq cpufreq_powersave cpufreq_userspace freq_table