Pi 2 b running at 600Mhz

[louiscar]

Hi all,

I decided to run a stress test on my pi using 'stress' with the following line.

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while true; do vcgencmd measure_clock arm; vcgencmd measure_temp; sleep 10; done& ./cpuburn-a53

immediately notice that it announces only 600mhz: Output is

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frequency(45)=600000000
temp=41.2'C
frequency(45)=600002000
temp=46.5'C
frequency(45)=600000000
temp=47.6'C

I upgraded/ updated and used rpi-update to update the kernel and am on 4.9 seemingly but the problem is still there.
I never noticed this problem before and guess the pi has been running at 600Mhz since I got it.

I've looked at a number of threads but have been unable to get this to run any faster.
I'd appreciate any help in finding out what the problem is.