inet_peer_threshold，默认值就是64K
https://www.kernel.org/doc/html/latest/networking/ip-sysctl.html
这个一般人应该用的非常少，因为个人电脑，很难说会达到这么多的peer量。
如果抛开，“INET peer storage”这个标题，这个参数的解释第一句还以为是和内存相关的参数。虽然和内存是有关联！这里的storage只是INET peer可以存储多少个peer的storage。如果超过这个量，就会主动删除掉比较旧的记录。
INET peer storage
inet_peer_threshold - INTEGER
The approximate size of the storage. Starting from this threshold entries will be thrown aggressively. This threshold also determines entries' time-to-live and time intervals between garbage collection passes. More entries, less time-to-live, less GC interval.
