Hi -rt users, and CC's, I'm attempting to squeeze the lowest audio-latency out of a laptop as possible, and in doing so would like to set the CPU to performance. CPU in laptop: Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors ondemand performance $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver acpi-cpufreq # Attempt to set performance governer $ echo "performance" >/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor bash: echo: write error: Invalid argument # Attempt to set min freq of 2GHz (max) of this core2duo $ echo 2000000 > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq bash: /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq: Permission denied As far as I can tell, it is currently impossible on the -rt kernel to change CPU governer? This is necessary for reliable low-latency audio for laptop musicians. What is necessary to fix cpufreq on -rt? Cheers, -Harry PS: I've CC'd maintainers of cpufreq, I hope that's OK, otherwise please inform me of normal practices on linux-rt-users ML -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
