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| H A D | meson-gxm.dtsi | 4592bfe9 Tue Nov 24 06:17:40 CST 2020 Christian Hewitt <christianshewitt@gmail.com> arm64: dts: meson: Add capacity-dmips-mhz attributes to GXM
GXM (S912) is a big-little design with CPUs 0-3 clocked at 1.5GHz
and CPUs 4-7 at 1.0GHz. Adding capacity-dmips-mhz attributes allows
the scheduler to factor the different clock speeds into capacity
calculations and prefer the higher-clocked cluster to improve
overall performance.
This was inspired by the similar change for G12B [0] boards. The
diference here is that all cores are A53's so the same dmips-mhz
value is used.
VIM2:~ # cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
1512000
1512000
1512000
1512000
1000000
1000000
1000000
1000000
before:
VIM2:~ # cat /sys/devices/system/cpu/cpu*/cpu_capacity
1024
1024
1024
1024
1024
1024
1024
1024
after:
VIM2:~ # cat /sys/devices/system/cpu/cpu*/cpu_capacity
1024
1024
1024
1024
677
677
677
677
The after value matches my table-napkin calculation:
(1000000 / 1512000 = 0.661) * 1024 = 677
[0] https://github.com/torvalds/linux/commit/6eeaf4d2452ec8b1ece58776812140734fc2e088
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20201124121740.25704-1-christianshewitt@gmail.com
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