On Mon, 2008-02-25 at 08:37 -0800, Arjan van de Ven wrote: > > I'll CC Tim who might be able to give you some other suggestions wrt specpower >
Martin, Some of the steps we have found to help include: 0. Employ large pages in Linux and in your java option. 1. Employ a tickless kernel, probably a kernel close to 2.6.24. 2. Turn on the ondemand governor (set /sys/devices/system/devices/system/cpu/cpu*/cpufreq/scaling_governor to ondemand). 3. Trun on the menu idle governor (set /sys/devices/system/cpu/cpuidle_governor_ro to menu) 4. Turning on the power aware scheduler (set /sys/devices/system/cpu/sched_mc_power_savings to 1) 5. Use a larger sampling (like 1000000) versus the default value of 2000 in /sys/devices/system/cpu/cpu*/cpufreq/ondemand/sampling_rate. For SPECpower workload, the load level is very steady, so it does not pay to shift gear to a high cpu frequency too quickly. 6. Employ idle microstate accounting (not yet available in distribution kernel) Also check the BIOS setting to make sure things like speedstep and fan speed and accoustic is set properly. Tim _______________________________________________ Discuss mailing list [email protected] http://mail.lesswatts.org/mailman/listinfo/discuss
