* Andrey Smirnov | 2014-06-10 11:52:05 [-0700]:

Eventually I am hoping to disable any sorts of frequency scaling or
power management on our system, but I am still curious to know if that
is a known issue patches for which exist. Does anyone has any leads/suggestions?

You need to breakout of the preempt_disable() region. However having
cpufreq running will have major effect on your latency so this might not
what you want in the long term.

Thank you,
Andrey Smirnov

Sebastian