This patchset adds AMD specific powersave bias function to the ondemand governor; which can be used to help ondemand governor make more power conscious frequency change decisions based on feedback from hardware (availble on AMD Family 16h and above).
Hardware feedback tells software how "sensitive" to frequency changes the workloads are. CPU-bound workloads will be more sensitive -- they will perform better as frequency increases. Memory/IO-bound workloads will be less sensitive -- they will not necessarily perform better as frequnecy increases. This patchset was compared against ondemand governor without powersave bias and did not show any performance degradation on CPU-bound workloads such as kernbench and unixbench. While saving power on Memory-bound workloads such as stream. This applies to linux-pm's linux-next branch, on top of Viresh's 'Implement per policy instance of governor' V4 patchset: https://lkml.org/lkml/2013/3/27/348 Jacob Shin (2): cpufreq: ondemand: allow custom od_ops to be registered cpufreq: AMD "frequency sensitivity feedback" powersave bias for ondemand governor arch/x86/include/uapi/asm/msr-index.h | 1 + drivers/cpufreq/Kconfig.x86 | 10 ++++++++++ drivers/cpufreq/Makefile | 1 + drivers/cpufreq/cpufreq_governor.h | 2 ++ drivers/cpufreq/cpufreq_ondemand.c | 32 +++++++++++++++++++++++++++----- 5 files changed, 41 insertions(+), 5 deletions(-) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
