70 lines
3.1 KiB
Bash
Executable File
70 lines
3.1 KiB
Bash
Executable File
#!/bin/sh /etc/rc.common
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START=98
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# ipq806x_power_auto()
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# Changes the governor to ondemand and sets the default parameters for cpu ondemand governor.
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# The parameters are tuned for best performance than for power.
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# Also, the up_thresholds have been set to low value, to workaround the cpu
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# utilization anamolies we are seeing with kcpustat with tickless kernel.
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ipq806x_power_auto() {
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echo "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
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echo "ondemand" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
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# Change the minimum operating frequency for CPU0.
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# This is required for cases where large amount of network traffic is sent
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# instantaneously without any ramp-up time , when CPU is at minimum perf level.
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# At 384 MHz, CPU0 stays fully busy in softirq context and doesn't move to ksoftirqd, and
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# doesn't give any other thread including cpufreq thread a chance to run.
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# Hence, the CPU frequency is locked up at 384MHz till the traffic is stopped.
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# Increasing the min frequency for CPU0 to 800 MHz (L2=1GHz), allows 4 Gbps instantaneous
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# traffic without any hangs/lockups.
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#
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# CPU1 min frequency also has to be increased because there is a hardware constraint
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# kraits cannot operate at 384MHz when L2 is at 1GHz.
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#
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# The impact on idle-state power with this change is about ~40-45mW.
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# echo "800000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
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# echo "800000" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_min_freq
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# Change sampling rate for frequency scaling decisions to 0,5s, from 10 ms
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echo "500000" > /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate
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# Change sampling rate for frequency down scaling decision to 10s
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echo 10 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor
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# Change the CPU load threshold above which frequency is up-scaled to
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# turbo frequency,to 50%
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echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
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}
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ipq40xx_power_auto() {
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# change scaling governor as ondemand to enable clock scaling based on system load
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echo "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
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# set scaling min freq as 200 MHz
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echo "200000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
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# Change sampling rate for frequency scaling decisions to 1s, from 10 ms
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echo "1000000" > /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate
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# Change sampling rate for frequency down scaling decision to 10s
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echo 10 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor
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# Change the CPU load threshold above which frequency is up-scaled to
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# turbo frequency,to 50%
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echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
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}
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start() {
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. /lib/functions/uci-defaults.sh
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local board=$(board_name)
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case "$board" in
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zyxel,nbg6817 | netgear,r7800 | db149 | ap148 | ap145 | ap148_1xx | db149_1xx | db149_2xx | ap145_1xx | ap160 | ap160_2xx | ap161 | ak01_1xx)
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ipq806x_power_auto ;;
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ap-dk01.1-c1 | ap-dk01.1-c2 | ap-dk04.1-c1 | ap-dk04.1-c2 | ap-dk04.1-c3 | ap-dk04.1-c4 | ap-dk04.1-c5 | ap-dk05.1-c1 | ap-dk06.1-c1 | ap-dk07.1-c1 | ap-dk07.1-c2 | ap-dk07.1-c3)
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ipq40xx_power_auto ;;
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esac
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}
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