I believe I found the root cause:
$ cpufreq-info |grep policy current policy: frequency should be within 933 MHz and 933 MHz.
So the frequency governor cannot select a faster speed than 933 MHz even tough the CPUs support 1.6 GHz.
I changed /etc/default/cpufrequtils to:
MAX_SPEED="1600000"
and have not seen the issue since.
A better fix would be to have /etc/init.d/cpufrequtils default to the max value if MAX_SPEED = 0.
I believe I found the root cause:
$ cpufreq-info |grep policy
current policy: frequency should be within 933 MHz and 933 MHz.
So the frequency governor cannot select a faster speed than 933 MHz even tough the CPUs support 1.6 GHz.
I changed /etc/default/ cpufrequtils to:
MAX_SPEED="1600000"
and have not seen the issue since.
A better fix would be to have /etc/init. d/cpufrequtils default to the max value if MAX_SPEED = 0.