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91 lines
3.0 KiB
91 lines
3.0 KiB
\chapter{CPU、DDR 和 NPU 频率}
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通常，板子上的各个单元的频率是动态调频，这种情况下测试出来的性能会有波动。为
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了防止性能测试结果不一致，在性能评估时，建议固定板子上的相关单元的频率再做测试。
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\section{CPU 定频命令}
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\subsection{查看 CPU 频率}
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
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\end{minted}
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\subsection{固定 CPU 频率}
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查看可用的频率
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencies
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\end{minted}
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可能的输出如下
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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408000 600000 816000 1008000 1200000 1416000 1608000 1800000
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\end{minted}
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设置 CPU 频率，如 1.8G
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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echo userspace > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
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echo 1800000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_setspeed
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\end{minted}
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\section{DDR 定频命令}
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\subsection{查看 DDR 频率}
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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cat /sys/class/devfreq/dmc/cur_freq
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\end{minted}
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\subsection{固定 DDR 频率}
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查看 DDR 可用的频率
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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cat /sys/class/devfreq/dmc/available_frequencies
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\end{minted}
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可能的输出如下
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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528000000 1068000000 1560000000 2112000000
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\end{minted}
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设置 DDR 频率，例如，2112000000MHZ
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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echo userspace > /sys/class/devfreq/dmc/governor
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echo 2112000000 > /sys/class/devfreq/dmc/userspace/set_freq
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\end{minted}
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\section{NPU 相关}
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\subsection{查看 NPU 频率}
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用下面命令查看：
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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cat /sys/kernel/debug/clk/clk_summary | grep clk_npu_dsu0
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\end{minted}
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可能的输出如下:
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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clk_npu_dsu0 3 6 0 250000000 0 0 50000
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\end{minted}
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\subsection{设置 NPU 频率(需要固件支持)}
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例如，设置为 1GHz
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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echo 1000000000 > /sys/kernel/debug/clk/clk_npu_dsu0/clk_rate
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\end{minted}
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\subsection{查询 NPU 驱动版本}
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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[root@openEuler ~]# cat /sys/kernel/debug/rknpu/version
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RKNPU driver: v0.8.2
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\end{minted}
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\subsection{查询 NPU 电源状态}
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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cat /sys/kernel/debug/rknpu/power
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\end{minted}
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\subsection{打开 NPU 电源}
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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echo on > /sys/kernel/debug/rknpu/power
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\end{minted}
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\subsection{关闭 NPU 电源}
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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echo off > /sys/kernel/debug/rknpu/power
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\end{minted}
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