uncore: Allow to configure uncore ELC control #731
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The Efficiency Latency Control (ELC) feature improves performance per watt. With this feature hardware power management algorithms optimize trade-off between latency and power consumption. Add additional configuration for uncore plugin to include attributes to configure ELC. Refer to Intel White Paper https://www.intel.com/content/www/us/en/content-details/826934/intel-xeon-6-processors-performance-and-power-profiles-default-latency-optimized-mode-and-other-options.html?DocID=826934 Linux kernel documentation: https://docs.kernel.org/admin-guide/pm/intel_uncore_frequency_scaling.html Example configuration: If the average CPU utilization is below 10% (elc_low_threshold_percent attribute below), uncore floor frequency of 1400MHz will be used (elc_floor_freq_khz attribute below) instead of hardware calculated minimum. [uncore_all] type=uncore elc_floor_freq_khz=1400000 elc_high_threshold_enable=1 elc_high_threshold_percent=95 elc_low_threshold_percent=10
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The Efficiency Latency Control (ELC) feature improves performance per watt. With this feature hardware power management algorithms optimize trade-off between latency and power consumption.
Add additional configuration for uncore plugin to include attributes to configure ELC.
Refer to Intel White Paper
https://www.intel.com/content/www/us/en/content-details/826934/intel-xeon-6-processors-performance-and-power-profiles-default-latency-optimized-mode-and-other-options.html?DocID=826934
Linux kernel documentation:
https://docs.kernel.org/admin-guide/pm/intel_uncore_frequency_scaling.html
Example configuration:
If the average CPU utilization is below 10% (elc_low_threshold_percent attribute below), uncore floor frequency of 1400MHz will be used (elc_floor_freq_khz attribute below) instead of hardware calculated minimum.
[uncore_all]
type=uncore
elc_floor_freq_khz=1400000
elc_high_threshold_enable=1
elc_high_threshold_percent=95
elc_low_threshold_percent=10