https://blog.wongcw.com/2021/04/09/%e9%bb%91%e4%ba%94%ef%bc%9avmshell%e9%a6%99%e6%b8%af300mbps%e9%ab%98%e9%80%9fcmi%e7%b7%9a%e8%b7%af1c-512mb%e5%b9%b4%e4%bb%988%e6%8a%98%e6%b5%81%e9%87%8f%e7%bf%bb%e5%80%8d%e5%85%8d%e8%b2%bb/