[SOLVED] cpu speed

sunils1973 · 10-22-2010, 08:38 AM

I have read some information regarding the cpu speed mismatch which says that there is some bios setting in which it shows different speed ( I don't know the source)

Currently When I checked with my system
/proc/cpuinfo, it shows the cpu as 2.5 dual core but

it shows the two cores as 1200MHz each. Does the speed 2.5 means speed of both the cores or of a single core?

I could'nt find bio settings regarding the same (Is it the cpu core multiplexing?)

My system is Pentium dual core E5200 2.5MH with Intel DG41PR motherboard.
Memory 3 GB (2GB 800 + 1GB 677). Is it the problem with memory?

thorkelljarl · 10-22-2010, 09:38 AM

Different speeds...

Your processor will show a higher or lower cyclic rate as it is throttled according to load. For Intel, the technology is called SpeedStep.

If you have the package installed, you can use the command "cpufreq-info" to see what the speed steps are for your CPU and which governor profile is in force.

http://linux.die.net/man/1/cpufreq-info

When you use a command to question your processor for its speed, the response is the cyclic rate at which the CPU is running at that moment.

thorkelljarl · 10-22-2010, 11:29 AM

Thereover...

There are setting in the BIOS of certain motherboards to control the speed of the CPU in order to overclock. If this is relevent, you should look at the manual for your board to see what your BIOS lets you do.

Neither the post on CPU stepping nor this post may be what you are interested in, but your reference to "some information" is not very exact. For a better answer, post a more explicit question.

sunils1973 · 10-23-2010, 01:39 AM

Thank u very much for the reply to my question
yes i learned the /proc/cpuinfo depends on the load (means it may vary, or may show different values on different situations) correct?

One more question.

I want to install virtualbox and gues os's windows XP and freeBSD and arch/gentoo as guests

shall I enable/disable core multiplexing in bios for functioning all the cpu cores.

(Now I know core multiplexing is disabling other cores such as whole cach memory can be utilised by the available core)

thorkelljarl · 10-23-2010, 08:18 AM

I don't know...

I would guess that running virtual programs would benefit more by using all the processor cores than by using one core with a larger cache, and it may depend upon and require that enough memory is installed on the system.

When you use a command to ask the CPU about its cyclic rate(speed), you get a snapshot of the rate at that moment.