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Power and performance measurements were made using my freqbench [1]
benchmark coordinator, which isolates, offlines, and disables the timer
tick on test CPUs to maximize accuracy. It uses EEMBC CoreMark [2] as
the workload and measures power usage using the PM8150B PMIC's fuel
gauge.
The energy model dynamic-power-coefficient values were calculated with
DPC = µW / MHz / V^2
for each OPP, and averaged across all OPPs within each cluster for the
final coefficient. Voltages were obtained from the qcom-cpufreq-hw
driver that reads voltages from the OSM LUT programmed into the SoC.
Normalized DMIPS/MHz capacity scale values for each CPU were calculated
from CoreMarks/MHz (CoreMark iterations per second per MHz), which
serves the same purpose. For each CPU, the final capacity-dmips-mhz
value is the C/MHz value of its maximum frequency normalized to
SCHED_CAPACITY_SCALE (1024) for the fastest CPU in the system.
A Xiaomi Redmi K30S Ultra device running a downstream Qualcomm 4.19
kernel was used for benchmarking to ensure proper frequency scaling and
other low-level controls.
Raw benchmark results can be found in the freqbench repository [3].
Below is a human-readable summary:
Frequency domains: cpu1 cpu4 cpu7
Offline CPUs: cpu1 cpu2 cpu3 cpu4 cpu5 cpu6 cpu7
Baseline power usage: 1223 mW
===== CPU 1 =====
Frequencies: 300 403 518 614 691 787 883 979 1075 1171 1248 1344 1420 1516 1612 1708 1804
300: 1114 3.7 C/MHz 29 mW 6.4 J 39.0 I/mJ 224.5 s
403: 1497 3.7 C/MHz 33 mW 5.5 J 45.2 I/mJ 167.0 s
518: 1925 3.7 C/MHz 48 mW 6.3 J 39.7 I/mJ 129.9 s
614: 2281 3.7 C/MHz 73 mW 8.0 J 31.1 I/mJ 109.6 s
691: 2566 3.7 C/MHz 46 mW 4.5 J 55.2 I/mJ 97.4 s
787: 2923 3.7 C/MHz 86 mW 7.4 J 33.8 I/mJ 85.5 s
883: 3279 3.7 C/MHz 77 mW 5.9 J 42.5 I/mJ 76.2 s
979: 3635 3.7 C/MHz 65 mW 4.4 J 56.2 I/mJ 68.8 s
1075: 3992 3.7 C/MHz 71 mW 4.4 J 56.2 I/mJ 62.6 s
1171: 4348 3.7 C/MHz 121 mW 6.9 J 36.0 I/mJ 57.5 s
1248: 4633 3.7 C/MHz 79 mW 4.2 J 58.9 I/mJ 54.0 s
1344: 4990 3.7 C/MHz 81 mW 4.0 J 61.7 I/mJ 50.1 s
1420: 5275 3.7 C/MHz 85 mW 4.0 J 61.8 I/mJ 47.4 s
1516: 5632 3.7 C/MHz 88 mW 3.9 J 64.3 I/mJ 44.4 s
1612: 5988 3.7 C/MHz 92 mW 3.8 J 65.4 I/mJ 41.7 s
1708: 6346 3.7 C/MHz 96 mW 3.8 J 66.3 I/mJ 39.4 s
1804: 6701 3.7 C/MHz 105 mW 3.9 J 63.5 I/mJ 37.3 s
===== CPU 4 =====
Frequencies: 710 825 940 1056 1171 1286 1382 1478 1574 1670 1766 1862 1958 2054 2150 2246 2342 2419
710: 6022 8.5 C/MHz 123 mW 5.1 J 49.1 I/mJ 41.5 s
825: 7001 8.5 C/MHz 142 mW 5.1 J 49.4 I/mJ 35.7 s
940: 7987 8.5 C/MHz 164 mW 5.1 J 48.7 I/mJ 31.3 s
1056: 8954 8.5 C/MHz 185 mW 5.2 J 48.3 I/mJ 27.9 s
1171: 9944 8.5 C/MHz 212 mW 5.3 J 46.9 I/mJ 25.2 s
1286: 10926 8.5 C/MHz 235 mW 5.4 J 46.4 I/mJ 22.9 s
1382: 11735 8.5 C/MHz 253 mW 5.4 J 46.4 I/mJ 21.3 s
1478: 12531 8.5 C/MHz 277 mW 5.5 J 45.2 I/mJ 20.0 s
1574: 13335 8.5 C/MHz 306 mW 5.7 J 43.6 I/mJ 18.8 s
1670: 14169 8.5 C/MHz 335 mW 5.9 J 42.2 I/mJ 17.7 s
1766: 14969 8.5 C/MHz 353 mW 5.9 J 42.3 I/mJ 16.7 s
1862: 15800 8.5 C/MHz 444 mW 7.0 J 35.6 I/mJ 15.8 s
1958: 16630 8.5 C/MHz 463 mW 7.0 J 35.9 I/mJ 15.0 s
2054: 17428 8.5 C/MHz 480 mW 6.9 J 36.3 I/mJ 14.4 s
2150: 18238 8.5 C/MHz 496 mW 6.8 J 36.8 I/mJ 13.7 s
2246: 19053 8.5 C/MHz 578 mW 7.6 J 32.9 I/mJ 13.1 s
2342: 19873 8.5 C/MHz 625 mW 7.9 J 31.8 I/mJ 12.6 s
2419: 20522 8.5 C/MHz 675 mW 8.2 J 30.4 I/mJ 12.2 s
===== CPU 7 =====
Frequencies: 844 960 1075 1190 1305 1401 1516 1632 1747 1862 1977 2073 2169 2265 2361 2457 2553 2649 2745 2841
844: 7172 8.5 C/MHz 155 mW 5.4 J 46.4 I/mJ 34.9 s
960: 8148 8.5 C/MHz 172 mW 5.3 J 47.4 I/mJ 30.7 s
1075: 9116 8.5 C/MHz 197 mW 5.4 J 46.2 I/mJ 27.4 s
1190: 10105 8.5 C/MHz 220 mW 5.4 J 46.0 I/mJ 24.8 s
1305: 11084 8.5 C/MHz 242 mW 5.5 J 45.8 I/mJ 22.6 s
1401: 11888 8.5 C/MHz 262 mW 5.5 J 45.4 I/mJ 21.0 s
1516: 12859 8.5 C/MHz 297 mW 5.8 J 43.2 I/mJ 19.5 s
1632: 13840 8.5 C/MHz 335 mW 6.1 J 41.3 I/mJ 18.1 s
1747: 14827 8.5 C/MHz 369 mW 6.2 J 40.1 I/mJ 16.9 s
1862: 15800 8.5 C/MHz 395 mW 6.3 J 40.0 I/mJ 15.8 s
1977: 16786 8.5 C/MHz 443 mW 6.6 J 37.9 I/mJ 14.9 s
2073: 17566 8.5 C/MHz 488 mW 6.9 J 36.0 I/mJ 14.2 s
2169: 18395 8.5 C/MHz 620 mW 8.4 J 29.7 I/mJ 13.6 s
2265: 19223 8.5 C/MHz 621 mW 8.1 J 30.9 I/mJ 13.0 s
2361: 20040 8.5 C/MHz 672 mW 8.4 J 29.8 I/mJ 12.5 s
2457: 20852 8.5 C/MHz 696 mW 8.3 J 29.9 I/mJ 12.0 s
2553: 21684 8.5 C/MHz 738 mW 8.5 J 29.3 I/mJ 11.5 s
2649: 22458 8.5 C/MHz 793 mW 8.8 J 28.3 I/mJ 11.1 s
2745: 23314 8.5 C/MHz 875 mW 9.4 J 26.6 I/mJ 10.7 s
2841: 24103 8.5 C/MHz 928 mW 9.6 J 26.0 I/mJ 10.4 s
[1] https://github.com/kdrag0n/freqbench
[2] https://www.eembc.org/coremark/
[3] https://github.com/kdrag0n/freqbench/tree/master/results/sm8250/k30s
Signed-off-by: Danny Lin <danny@kdrag0n.dev>
Link: https://lore.kernel.org/r/20210112013255.415253-2-danny@kdrag0n.dev
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.