Changeset 25754 in vbox for trunk/src/VBox/Devices/Network

Timestamp:

Jan 12, 2010 11:42:06 AM (15 years ago)

Author:

vboxsync

Message:

NAT: xtracker 4583: hopefully fix 100% CPU load with NAT under certain circumstances

File:

• trunk/src/VBox/Devices/Network/slirp/tcp_subr.c (modified) (1 diff)

trunk/src/VBox/Devices/Network/slirp/tcp_subr.c

@@ -363 +363 @@
         && tp->t_state >= TCPS_FIN_WAIT_2)
         soisfdisconnected(tp->t_socket);
-    if (tp)
+    /*
+     * (vasily) there're situations when the FIN or FIN,ACK are lost (Windows host)
+     * and retransmitting keeps VBox busy on sending closing sequences *very* frequent,
+     * easting a lot of CPU. To avoid this we don't sent on sockets marked as closed
+     * (see slirp.c for details about setting so_close member).
+     */
+    if (   tp
+#ifdef RT_OS_WINDOWS
+        && tp->t_socket
+        && !tp->t_socket->so_close
+#endif
+        )
         tcp_output(pData, tp);
 }