Difference between revisions of "APITestPage/zh"

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===如何超频===
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=====选择合格的电源=====
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超频使用R2S需要保证有稳定可靠的电源供应,这包括标称真实,质量可靠的电源适配器,以及低阻抗的MicroUSB连接线(通俗讲就是铜芯足够粗),经我们测试,市面有如下可选:
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[[File:R2spower4.jpg|frameless|800px]]<br />
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<b>友善定制版5v3a电源购买链接</b>:https://www.friendlyarm.com/index.php?route=product/product&product_id=141&search=USB&description=true&category_id=0 <br />
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=====保证散热措施=====
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超频会令NanoPi-R2S发热增加,必须使用金属外壳进行散热,或DIY使用风扇进行主动散热,旧版的塑料外壳没法胜任。<br />
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另外TF卡也建议使用能支持高温条件下正常工作的TF卡,可以选购行车记录仪专用的TF卡; <br />
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[[File:Nanopir2s-working.jpg|frameless|500px]]<br />
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====超频测试固件====
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该FriendlyWrt固件已解锁1.51G的CPU频率,可从以下地址下载:https://pan.baidu.com/s/1qGf9LtNFzxrcDsIKHpRMlg  密码: 80gs<br />
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登录FriendlyWrt的网页,点击菜单项 服务->ttyd 进入终端,输入以下命令:<br />
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<syntaxhighlight lang="bash">
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dd if=/dev/zero of=/dev/null bs=1M&
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cat /sys/devices/system/cpu/cpu[04]/cpufreq/cpuinfo_cur_freq
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</syntaxhighlight>
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就可以看到 R2S 已经运行在 1.51G:<br />
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[[File:Nanopir2s-wrt-overclock.png|frameless|600px]]<br />
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====超频前后的性能测试====
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测试命令:
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<syntaxhighlight lang="bash">
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openssl speed -evp aes-256-gcm
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</syntaxhighlight>
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超频前的SSL性能(CPU主频:1.29G):
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<syntaxhighlight lang="bash">
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The 'numbers' are in 1000s of bytes per second processed.
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type            16 bytes    64 bytes    256 bytes  1024 bytes  8192 bytes  16384 bytes
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aes-256-gcm      68976.85k  189985.39k  342481.66k  432472.75k  466349.46k  466414.25k
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</syntaxhighlight>
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超频后的SSL性能(CPU主频:1.51G):
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<syntaxhighlight lang="bash">
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type            16 bytes    64 bytes    256 bytes  1024 bytes  8192 bytes  16384 bytes
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aes-256-gcm      80187.19k  222333.58k  399549.27k  504449.02k  542182.06k  545855.70k
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</syntaxhighlight>
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可以看到aes-256-gcm该项的性能提升了16%。
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====超频方法====
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=====修改内核解锁更高的CPU频率=====
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在FriendlyWrt Repo源代码的目录下,用vim打开以下文件:
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<syntaxhighlight lang="bash">
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vim kernel/arch/arm64/boot/dts/rockchip/rk3328.dtsi
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</syntaxhighlight>
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在文件中搜索文本 opp-1296000000,在opp-1296000000定义后面,增加CPU频率1.51G的定义,修改后的内容如下所示:
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<syntaxhighlight lang="bash">
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        opp-1296000000 {
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            opp-hz = /bits/ 64 <1296000000>;
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            opp-microvolt = <1300000>;
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            clock-latency-ns = <40000>;
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        };
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        opp-1512000000 {
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            opp-hz = /bits/ 64 <1512000000>;
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            opp-microvolt = <1450000>;
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            clock-latency-ns = <40000>;
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        };
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</syntaxhighlight>
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修改完成后,重新编译内核,并制作SD固件:
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<syntaxhighlight lang="bash">
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./build.sh kernel
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./build.sh sd-img
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</syntaxhighlight>
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=====验证CPU是否超频成功=====
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执行以下命令让CPU产生负载:
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<syntaxhighlight lang="bash">
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dd if=/dev/zero of=/dev/null bs=1M&
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</syntaxhighlight>
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再用如下命令查看当前的CPU频率,可以看到频率已经是1.5G:
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<syntaxhighlight lang="bash">
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root@FriendlyWrt:~# cat /sys/devices/system/cpu/cpu[04]/cpufreq/cpuinfo_cur_freq
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1512000
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</syntaxhighlight>
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Revision as of 06:05, 25 March 2023

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