S912 limited to 1200 MHz with multithreaded loads

[numbqq]

@tkaiser

You could give this a try:

#!/bin/bash
echo performance >/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo performance >/sys/devices/system/cpu/cpu4/cpufreq/scaling_governor
for o in 1 4 8 ; do
for i in $(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies) ; do
echo $i >/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
echo $i >/sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq 2>/dev/null
case $o in
1)
TasksetParm=“-c 0”
;;
4)
TasksetParm=“-c 0-3”
;;
*)
TasksetParm=“-c 0-7”
;;
esac
echo -e “$o cores, $(( $i / 1000)) MHz: \c”
taskset ${TasksetParm} sysbench --test=cpu --cpu-max-prime=20000 run --num-threads=$o 2>&1 | grep ‘execution time’
cat /sys/devices/virtual/thermal/thermal_zone0/temp
done
done

Use this script got different result

1 cores, 100 MHz:     execution time (avg/stddev):   382.9829/0.00
43000
1 cores, 250 MHz:     execution time (avg/stddev):   148.9977/0.00
43000
1 cores, 500 MHz:     execution time (avg/stddev):   73.8164/0.00
43000
1 cores, 667 MHz:     execution time (avg/stddev):   55.2353/0.00
43000
1 cores, 1000 MHz:     execution time (avg/stddev):   36.7397/0.00
44000
1 cores, 1200 MHz:     execution time (avg/stddev):   30.5951/0.00
44000
1 cores, 1512 MHz:     execution time (avg/stddev):   25.9128/0.00
45000
4 cores, 100 MHz:     execution time (avg/stddev):   94.4586/0.01
43000
4 cores, 250 MHz:     execution time (avg/stddev):   37.1176/0.01
44000
4 cores, 500 MHz:     execution time (avg/stddev):   18.4188/0.00
45000
4 cores, 667 MHz:     execution time (avg/stddev):   13.7993/0.00
45000
4 cores, 1000 MHz:     execution time (avg/stddev):   9.1685/0.00
46000
4 cores, 1200 MHz:     execution time (avg/stddev):   7.6367/0.00
46000
4 cores, 1512 MHz:     execution time (avg/stddev):   6.4686/0.00
47000
8 cores, 100 MHz:     execution time (avg/stddev):   47.7804/0.01
44000
8 cores, 250 MHz:     execution time (avg/stddev):   18.7053/0.01
45000
8 cores, 500 MHz:     execution time (avg/stddev):   9.2905/0.00
45000
8 cores, 667 MHz:     execution time (avg/stddev):   6.9671/0.00
46000
8 cores, 1000 MHz:     execution time (avg/stddev):   4.6269/0.00
48000
8 cores, 1200 MHz:     execution time (avg/stddev):   4.1788/0.01
49000
8 cores, 1512 MHz:     execution time (avg/stddev):   3.8022/0.00
50000```