CPU Tuning Recommendations
PROCEDURE FOR KEEPING ENSURING CPU FREQUENCIES STAY CONSISTENT
This procedure assumes that the BIOS settings allow control of c-states to be levered by the O/S directly. Here's a set of settings this procedure has been tested with.
Recommended ASU Settings for sandy bridge clusters:
Two pieces are required:
1) Changes to /sys/devices/system/cpu/cpu*/cpufreq/scaling as defined in the set_cpu_perfmode script:
2) We need to run "set_dma_latency 2" as part of the post-script procedure to inhibit power-saving c-states.
compile with "cc set_dma_latency.c -o set_dma_latency" and execute from a boot script (set_dma_latency must be kept running to inhibit power saving c-states.