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4 Intel(R) Speed Select Technology User Guide
7 The Intel(R) Speed Select Technology (Intel(R) SST) provides a powerful new
9 With Intel(R) SST, one server can be configured for power and performance for a
14 - https://www.intel.com/content/www/us/en/architecture-and-technology/speed-select-technology-artic…
15 - https://builders.intel.com/docs/networkbuilders/intel-speed-select-technology-base-frequency-enha…
21 and configure these features is by using the Intel Speed Select utility.
23 This document explains how to use the Intel Speed Select tool to enumerate and
24 control Intel(R) SST features. This document gives example commands and explains
29 intel-speed-select configuration tool
32 Most Linux distribution packages may include the "intel-speed-select" tool. If not,
38 # cd tools/power/x86/intel-speed-select/
47 # intel-speed-select --help
52 # intel-speed-select perf-profile --help
56 # intel-speed-select perf-profile info --help
62 #intel-speed-select --info
66 # intel-speed-select --info
67 Intel(R) Speed Select Technology
73 Intel(R) SST-PP (feature perf-profile) is supported
75 Intel(R) SST-TF (feature turbo-freq) is supported
76 Intel(R) SST-BF (feature base-freq) is not supported
77 Intel(R) SST-CP (feature core-power) is supported
79 Intel(R) Speed Select Technology - Performance Profile (Intel(R) SST-PP)
84 to choose a specific server configuration statically. This Intel(R) Speed Select
85 Technology - Performance Profile (Intel(R) SST-PP) feature introduces a mechanism
91 "perf-profile" when using the Intel Speed Select tool.
99 # intel-speed-select perf-profile get-config-levels
100 Intel(R) Speed Select Technology
124 # intel-speed-select perf-profile get-lock-status
125 Intel(R) Speed Select Technology
143 # intel-speed-select perf-profile info -l 0
144 Intel(R) Speed Select Technology
169 understand more, execute "intel-speed-select perf-profile info" for performance
172 # intel-speed-select perf-profile info -l 4
173 Intel(R) Speed Select Technology
198 # intel-speed-select perf-profile get-config-current-level
199 Intel(R) Speed Select Technology
243 # intel-speed-select -d perf-profile set-config-level -l 4 -o
244 Intel(R) Speed Select Technology
265 Check presence of other Intel(R) SST features
269 other two Intel(R) SST features (Intel(R) Speed Select Technology - Base Frequency
270 (Intel(R) SST-BF) and Intel(R) Speed Select Technology - Turbo Frequency (Intel
284 Given these results, the "speed-select-base-freq" (Intel(R) SST-BF) in level 4
290 "speed-select-turbo-freq" (Intel(R) SST-TF) is supported at both performance
293 The Intel(R) SST-BF and the Intel(R) SST-TF features are built on a foundation
294 technology called Intel(R) Speed Select Technology - Core Power (Intel(R) SST-CP).
295 The platform firmware enables this feature when Intel(R) SST-BF or Intel(R) SST-TF
298 Intel(R) Speed Select Technology Core Power (Intel(R) SST-CP)
301 Intel(R) Speed Select Technology Core Power (Intel(R) SST-CP) is an interface that
321 # intel-speed-select core-power enable --help
322 Intel(R) Speed Select Technology
349 # intel-speed-select core-power enable
350 Intel(R) Speed Select Technology
368 # intel-speed-select -c 0 core-power info
369 Intel(R) Speed Select Technology
396 # intel-speed-select core-power config --help
397 Intel(R) Speed Select Technology
407 # intel-speed-select core-power config -c 0
408 Intel(R) Speed Select Technology
435 # intel-speed-select core-power get-config -c 0
436 Intel(R) Speed Select Technology
464 # intel-speed-select core-power assoc --help
465 Intel(R) Speed Select Technology
473 # intel-speed-select -c 10 core-power assoc -c 3
474 Intel(R) Speed Select Technology
489 # intel-speed-select -c 10 core-power get-assoc
490 Intel(R) Speed Select Technology
506 # intel-speed-select core-power disable
508 Some features like Intel(R) SST-TF can only be enabled when CLOS based prioritization
509 is enabled. For this reason, disabling while Intel(R) SST-TF is enabled can cause
510 Intel(R) SST-TF to fail. This will cause the "disable" command to display an error
511 if Intel(R) SST-TF is already enabled. In turn, to disable, the Intel(R) SST-TF
514 Intel(R) Speed Select Technology - Base Frequency (Intel(R) SST-BF)
517 The Intel(R) Speed Select Technology - Base Frequency (Intel(R) SST-BF) feature lets
524 The support of Intel(R) SST-BF depends on the Intel(R) Speed Select Technology -
525 Performance Profile (Intel(R) SST-PP) performance level configuration. It is
526 possible that only certain performance levels support Intel(R) SST-BF. It is also
527 possible that only base performance level (level = 0) has support of Intel
531 In the system under test here, Intel(R) SST-BF is supported at the base
534 # intel-speed-select -c 0 perf-profile info -l 0
535 Intel(R) Speed Select Technology
546 Before enabling Intel(R) SST-BF and measuring its impact on a workload
555 Based on the output of the "intel-speed-select perf-profile info -l 0" base
564 performance using Intel(R) SST-BF.
600 Intel(R) SST-BF Capabilities
603 To get capabilities of Intel(R) SST-BF for the current performance level 0,
606 # intel-speed-select base-freq info -l 0
607 Intel(R) Speed Select Technology
623 via high-priority-cpu-list/high-priority-cpu-mask. But if this Intel(R) SST-BF
626 clipping of low priority CPUs is acceptable, then the user can enable Intel
631 Enable Intel(R) SST-BF
634 To enable Intel(R) SST-BF feature, execute::
636 # intel-speed-select base-freq enable -a
637 Intel(R) Speed Select Technology
650 In this case, -a option is optional. This not only enables Intel(R) SST-BF, but it
651 also adjusts the priority of cores using Intel(R) Speed Select Technology Core
652 Power (Intel(R) SST-CP) features. This option sets the minimum performance of each
653 Intel(R) Speed Select Technology - Performance Profile (Intel(R) SST-PP) class to
658 Intel(R) SST-BF:
660 - Discover Intel(R) SST-BF and note low and high priority base frequency
676 This way, by enabling Intel(R) SST-BF, the performance of this benchmark is
698 Disable Intel(R) SST-BF
701 To disable the Intel(R) SST-BF feature, execute::
703 # intel-speed-select base-freq disable -a
706 Intel(R) Speed Select Technology - Turbo Frequency (Intel(R) SST-TF)
718 The support of Intel(R) Speed Select Technology - Turbo Frequency (Intel(R) SST-TF)
719 depends on the Intel(R) Speed Select Technology - Performance Profile (Intel
721 performance level supports Intel(R) SST-TF. It is also possible that only the base
722 performance level (level = 0) has the support of Intel(R) SST-TF. Hence, first
725 In the system under test here, Intel(R) SST-TF is supported at the base
728 # intel-speed-select -c 0 perf-profile info -l 0
729 Intel(R) Speed Select Technology
741 To check if performance can be improved using Intel(R) SST-TF feature, get the turbo
742 frequency properties with Intel(R) SST-TF enabled and compare to the base turbo
750 # intel-speed-select perf-profile info -l 0
751 Intel(R) Speed Select Technology
817 13, first check the capability of the Intel(R) SST-TF feature for this performance
820 Get Intel(R) SST-TF Capability
825 # intel-speed-select turbo-freq info -l 0
826 Intel(R) Speed Select Technology
852 Based on the output above, there is an Intel(R) SST-TF bucket for which there are
861 Enable Intel(R) SST-TF
864 To enable Intel(R) SST-TF, execute::
866 # intel-speed-select -c 12,13 turbo-freq enable -a
867 Intel(R) Speed Select Technology
885 In this case, the option "-a" is optional. If set, it enables Intel(R) SST-TF
886 feature and also sets the CPUs to high and low priority using Intel Speed
887 Select Technology Core Power (Intel(R) SST-CP) features. The CPU numbers passed
891 Intel(R) SST-TF:
893 - Discover Intel(R) SST-TF and note buckets of high priority cores and maximum frequency