当t cp的慢速计时器每隔500毫秒计时到期的时候，将调用tcp_slowtimo。

When TCP's slow timer expires every 500ms, tcp_slowtimo gets called.

youdao

在测量键释放时间（大多数是几百毫秒）时，极有可能无法匹配精确到毫秒的键释放计时。

When measuring intra-key release times, most often in the hundreds of milliseconds, it is highly unlikely to match the precise millisecond of the key release.

youdao

如果密码之间的击键差异小于 maxKeyDiff 阈值（100 毫秒），则认为计时是匹配的。

Timings are considered a match if the differences between the keystrokes across passwords are less than the maxKeyDiff threshold (100 milliseconds).

youdao