The Linux kernel uses various sources such as user input to generate entropy, which is in turn used for generating random numbers. Encrypted communications can use a lot of entropy, and often the amount of entropy generated by your system will not be sufficient. This is commonly an issue on headless server systems, which can also include ARM systems such as Raspberry Pi, and can result in slower than normal ssh connections among other issues.
Linux 内核使用各种来源，如用户输入来产生熵，而熵又用于产生随机数。加密通信可能会使用大量的熵，往往你的系统产生的熵量是不够的。这通常是无头服务器系统上的问题，其中也可以包括 Raspberry Pi 等 ARM 系统，并可能导致比正常的 ssh 连接更慢等问题。