77 lines
3.2 KiB
Bash
Executable File
77 lines
3.2 KiB
Bash
Executable File
#!/bin/sh /etc/rc.common
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START=99
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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 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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echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold_any_cpu_load
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echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold_multi_core
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# Change the CPU load threshold below which frequency is down-scaled to
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# 20% (down_threshold = up_threshold - down_differential)
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echo 30 > /sys/devices/system/cpu/cpufreq/ondemand/down_differential
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# Set sync_freq and optimal_freq used for multicore scenarios to max
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# freq
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echo "1000000" > /sys/devices/system/cpu/cpufreq/ondemand/optimal_freq
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echo "1000000" > /sys/devices/system/cpu/cpufreq/ondemand/sync_freq
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}
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# ipq806x_power_turbo()
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# Sets the Krait CPU/L2 and NSS NetAP core clock frequencies to fixed Turbo frequencies
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# No frequency scaling is done in this profile
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ipq806x_power_turbo() {
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echo "userspace" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
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echo "userspace" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
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echo "1400000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
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echo "1400000" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_setspeed
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echo 733000000 > /proc/sys/dev/nss/clock/current_freq
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}
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start() {
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config_load system
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config_get mode powerctl mode "auto"
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if eval "type ipq806x_power_${mode}" 2>/dev/null >/dev/null; then
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eval ipq806x_power_${mode}
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else
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echo "\"${mode}\" power mode not supported"
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fi
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}
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