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ipq806x: improve system latency

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Various report and data show that the freq 384000 is too low and cause some
extra latency to the entire system. OEM qsdk code also set the min frequency
for this target to 800 mhz.
Also some user notice some instability with this idle frequency, solved by
setting the min frequency to 600mhz. Fix all these kind of problem by
introducing a boot init.d script that set the min frequency to 600mhz and set
the ondemand governor to be more aggressive. The script set these value only if
the ondemand governor is detected. 384 mhz freq is still available and user can
decide to restore the old behavior by disabling this script.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: maurerr <mariusd84@gmail.com>
This commit is contained in:
Ansuel Smith 2021-03-28 03:29:59 +02:00 committed by maurerr
parent 8773bedcd2
commit 20aa742475
1 changed files with 17 additions and 0 deletions
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17
target/linux/ipq806x/base-files/etc/init.d/cpufreq Executable file
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#!/bin/sh /etc/rc.common
START=15
boot() {
local governor
governor=$(cat /sys/devices/system/cpu/cpufreq/policy0/scaling_governor)
if [ "$governor" = "ondemand" ]; then
# Effective only with ondemand
echo 600000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq
echo 600000 > /sys/devices/system/cpu/cpufreq/policy1/scaling_min_freq
echo 10 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor
echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
fi
}