looks normal too me
the upscaling from 250 MHz to 1GHz for 8-10 or quicker is normal, that is because of the "ondemand" setting of the CPU (not really sure but that is what i read).
Ondemand gives the cpu to switch from the lowest available freq to the highest without scaling on other mid freqs. i believe.
check your cpu usage again, you might have instances that your cpu runs constant @ 100%