Changeset 51905 in vbox for trunk/src/VBox/Devices/Network/slirp

Timestamp:

Jul 7, 2014 3:58:35 PM (11 years ago)

Author:

vboxsync

Message:

NAT: Make sure guest will get window updates by scheduling TF_DELACK
on successful sowrite().

This code is a moral equivalent of calling tcp_output() for PRU_RCVD
in tcp_usrreq() of the real stack. This is intended to be a
minimalistic fix to prevent guest from being stuck after we close
offered window. Guest's persist timer eventually lets it continue,
but wastes a lot of wall time, making outbound transfers very slow.

File:

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

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

@@ -860 +860 @@
     }
     else if (!fConnectOnly)
+    {
         SOWRITE(ret, pData, so);
+        if (RT_LIKELY(ret > 0))
+        {
+            /*
+             * Make sure we will send window update to peer.  This is
+             * a moral equivalent of calling tcp_output() for PRU_RCVD
+             * in tcp_usrreq() of the real stack.
+             */
+            struct tcpcb *tp = sototcpcb(so);
+            if (RT_LIKELY(tp != NULL))
+                tp->t_flags |= TF_DELACK;
+        }
+    }
     /*
      * XXX If we wrote something (a lot), there could be the need