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108 lines
3.7 KiB
108 lines
3.7 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(单位是 kHZ):
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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,2112000000 HZ
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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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\chapter{U-Boot 快捷键}
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RK平台提供串口组合键触发一些事件用于调试、烧写(如果无法触发,请多尝试几次;启用 secure-boot
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时无效)。\textbf{开机时长按}:
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\begin{itemize}[itemsep=0pt,topsep=0pt,parsep=0pt]
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\item \texttt{ctrl+c:}进入 U-Boot 命令行模式;
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\item \texttt{ctrl+d:}进入 loader 烧写模式;
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\item \texttt{ctrl+b:}进入 maskrom 烧写模式;
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\item \texttt{ctrl+f:}进入 fastboot 模式;
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\item \texttt{ctrl+m:}打印 bidram/system 信息;
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\item \texttt{ctrl+i:}使能内核 initcall\_debug;
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\item \texttt{ctrl+p:}打印 cmdline 信息;
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\item \texttt{ctrl+s:}``Starting kernel...'' 之后进入 U-Boot 命令行;
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\end{itemize}
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