2

I use centos 6.4 64. I have old proc - CPU AMD Phenom II X4 810 (HDX810W) 2.6 GHz. However, when I execute the command cat /proc/cpuinfo I get the following:

processor   : 0
vendor_id   : AuthenticAMD
cpu family  : 16
model       : 4
model name  : AMD Phenom(tm) II X4 810 Processor
stepping    : 2
cpu MHz     : 800.000
cache size  : 512 KB
physical id : 0
...

All four cores have the same speed 800 MHz. How to explain it?

5

That's the current CPU frequency; it can be scaled up and down.

Have a look in /sys/devices/system/cpu/cpu0 (or 1, 2, 3), then the cpufreq directory.

Check cat scaling_governor. It is probably ondemand (I believe that's the default kernel configuration). Now check scaling_available_frequencies; you'll see a list that for you should start with 2600000.

The kernel will boost the frequency when required. Try a busy loop, with bash:

while (( 1 )); do echo busy; done

Let that go and check your frequencies. They should go up. If you have a CPU monitor and one of them hits close to 100%, that core will probably be at the max frequency now.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.