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18f12e6f69
Doing a simple ping to my device shows this:
64 bytes from 10.0.253.101: icmp_seq=1 ttl=64 time=2.00 ms
64 bytes from 10.0.253.101: icmp_seq=2 ttl=64 time=2.02 ms
64 bytes from 10.0.253.101: icmp_seq=3 ttl=64 time=1.68 ms
64 bytes from 10.0.253.101: icmp_seq=4 ttl=64 time=1.91 ms
64 bytes from 10.0.253.101: icmp_seq=5 ttl=64 time=1.92 ms
64 bytes from 10.0.253.101: icmp_seq=6 ttl=64 time=2.04 ms
Some users even report higher values on older kernels:
64 bytes from 192.168.1.10: seq=0 ttl=64 time=0.612 ms
64 bytes from 192.168.1.10: seq=1 ttl=64 time=2.852 ms
64 bytes from 192.168.1.10: seq=2 ttl=64 time=2.719 ms
64 bytes from 192.168.1.10: seq=3 ttl=64 time=2.741 ms
64 bytes from 192.168.1.10: seq=4 ttl=64 time=2.808 ms
The problem is that the governor is set to Ondemand, which causes
the CPU to clock all the way down to 48MHz in some cases.
Switching to performance governor:
64 bytes from 10.0.253.101: icmp_seq=1 ttl=64 time=0.528 ms
64 bytes from 10.0.253.101: icmp_seq=2 ttl=64 time=0.561 ms
64 bytes from 10.0.253.101: icmp_seq=3 ttl=64 time=0.633 ms
64 bytes from 10.0.253.101: icmp_seq=4 ttl=64 time=0.526 ms
In theory, using the Performance governor should increase power draw,
but it looks like it really does not matter for this soc.
Using a calibrated precision DC power supply (cpu idle):
Ondemand
24.00V * 0.134A = 3.216 Watts
48.00V * 0.096A = 4.608 Watts
Performance
24.00V * 0.135A = 3.240 Watts
48.00V * 0.096A = 4.608 Watts
Let's simply switch to the Performance governor by default
to fix the general jittery behaviour on devices using this soc.
Tested on: MikroTik wAP ac
Fixes: #13649
Reviewed-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Thibaut VARÈNE <hacks@slashdirt.org>
Signed-off-by: Koen Vandeputte <koen.vandeputte@citymesh.com>
(cherry picked from commit
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| apm821xx | ||
| arc770 | ||
| archs38 | ||
| armvirt | ||
| at91 | ||
| ath25 | ||
| ath79 | ||
| bcm27xx | ||
| bcm47xx | ||
| bcm53xx | ||
| bcm63xx | ||
| bcm4908 | ||
| gemini | ||
| generic | ||
| imx6 | ||
| ipq40xx | ||
| ipq806x | ||
| kirkwood | ||
| lantiq | ||
| layerscape | ||
| malta | ||
| mediatek | ||
| mpc85xx | ||
| mvebu | ||
| mxs | ||
| octeon | ||
| octeontx | ||
| omap | ||
| oxnas | ||
| pistachio | ||
| ramips | ||
| realtek | ||
| rockchip | ||
| sunxi | ||
| tegra | ||
| uml | ||
| x86 | ||
| zynq | ||
| Makefile | ||