pic shows use with php 5.1.
Note that it is not Apache.exe (and thus not the php-system) that uses this. It is SQLyog .exe!
It occurs like that when data traffic over TCP has come to an end.
Nothing like it appears when not using tunnelling.
To reproduce simply click on checkbox “show all” with a reasonable big DB (remember to tunnel!), open Task Manager and a Network Monitoring program and watch things.