On 15/06/17 04:34, Kim Phillips wrote: [...] > > How does one tell whether writes to /dev/cpu_dma_latency are effective? > Watch /sys/devices/system/cpu/cpu*/cpuidle/state*/{usage,time}, they shouldn't tick based on the value set to cpu_dma_latency. E.g. a value of 0 should stop entering all the idle states. -- Regards, Sudeep