CPU Remains at Low Frequency After Oracle Linux 5.9 or 6.4 Reboot or Power Cycle (16728705, 17181067)

When the power budget is hard-capped, the CPU might remain at a low frequency after an Oracle Linux 5.9 or 6.4 system is rebooted or power cycled.

Workaround

1. View the CPU information to be modified. Type:

   # cat /proc/cpuinfo | grep processor

2. Obtain the maximum CPU frequency supported. Type:

   # cat /sys/devices/system/cpu/cpuN/cpufreq/cpuinfo_max_freq

   where N is the CPU ID to be modified.

3. Obtain the scaling_max_freq for each CPU ID. Type:

   # cat /sys/devices/system/cpu/cpuN/cpufreq/scaling_max_freq

4. For each CPU where the scaling maximum frequency is less than the maximum supported frequency, set the new scaling maximum frequency. Type:

   # echo $max_frequency > /sys/devices/system/cpu/cpuN/cpufreq/scaling_max_freq

   where $max_frequency is the determined max frequency shown in step 2

5. Verify the new scaling max frequency. Type:

   # cat /sys/devices/system/cpu/cpuN/cpufreq/cpuinfo/scaling_max_freq