admin-guide/pm/intel-speed-select.rst

302 allows users to define per core priority. This defines a mechanism to distribute
309 service and hence an associated priority. The granularity is at core level not
316 and use a priority type. There is a default per platform priority type, which
325 	Clos Enable: Specify priority type with [--priority|-p]
328 There are two types of priority types:
332 Priority for ordered throttling is defined based on the index of the assigned
333 CLOS group. Where CLOS0 gets highest priority (throttled last).
335 Priority order is:
340 When proportional priority is used, there is an additional parameter called
342 proportional priority is to provide each core with the requested min., then
344 weight. This proportional priority can be configured using "core-power config"
347 To enable with the platform default priority type, execute::
364 multiple dies. To check if CLOS is enabled and get priority type, "core-power
378         priority-type:proportional
386         priority-type:proportional
401 	Specify clos Proportional Priority [--weight|-w]
444         clos-proportional-priority:0
454         clos-proportional-priority:0
520 the thread at higher base frequency on specific sets of CPUs (high priority
521 CPUs) at the cost of lower base frequency (low priority CPUs) on other CPUs.
522 This feature does not require offline of the low priority CPUs.
613         high-priority-base-frequency(MHz):3000
614         high-priority-cpu-mask:00000216,00002160
615         high-priority-cpu-list:5,6,8,13,33,34,36,41
616         low-priority-base-frequency(MHz):2400
623 via high-priority-cpu-list/high-priority-cpu-mask. But if this Intel(R) SST-BF
625 high-priority-cpu-list) can only offer up to 2400 MHz. As a result, if this
626 clipping of low priority CPUs is acceptable, then the user can enable Intel
628 CPUs are used, they can be scheduled on high priority CPUs and can get boost of
651 also adjusts the priority of cores using Intel(R) Speed Select Technology Core
660 - Discover Intel(R) SST-BF and note low and high priority base frequency
667 workload to high priority CPUs (CPU 5 and 6 in this case)::
678 observed that the high priority CPUs reached 3000 MHz compared to 2600 MHz.
710 to cores based on the priority. By using this feature, some cores can be
711 configured to get higher turbo frequency by designating them as high priority at
712 the cost of lower or no turbo frequency on the low priority cores.
833             high-priority-cores-count:2
834             high-priority-max-frequency(MHz):3200
835             high-priority-max-avx2-frequency(MHz):3200
836             high-priority-max-avx512-frequency(MHz):3100
838             high-priority-cores-count:4
839             high-priority-max-frequency(MHz):3100
840             high-priority-max-avx2-frequency(MHz):3000
841             high-priority-max-avx512-frequency(MHz):2900
843             high-priority-cores-count:6
844             high-priority-max-frequency(MHz):3100
845             high-priority-max-avx2-frequency(MHz):3000
846             high-priority-max-avx512-frequency(MHz):2900
848             low-priority-max-frequency(MHz):2600
849             low-priority-max-avx2-frequency(MHz):2400
850             low-priority-max-avx512-frequency(MHz):2100
853 two high priority cores. If only two high priority cores are set, then max.
857 In turn, for the hackbench workload, two CPUs can be set as high priority and
858 rest as low priority. One side effect is that once enabled, the low priority
886 feature and also sets the CPUs to high and low priority using Intel Speed
888 with "-c" arguments are marked as high priority, including its siblings.
893 - Discover Intel(R) SST-TF and note buckets of high priority cores and maximum frequency
897 - Subscribe desired CPUs to CLOS groups making sure that high priority cores are set to the maximum…
900 priority CPUs::