From: Matthew Dillon <dillon@apollo.backplane.com>
Date: Fri, 10 Aug 2012 18:20:24 +0000 (-0700)
Subject: hammer2 - Message span tree work
X-Git-Tag: v3.4.0rc~1022
X-Git-Url: http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/c1963fb27dcd022b165fc27bb6586af2ea3ac41d

hammer2 - Message span tree work

* Trivially optimize out the sending of a SPAN back across the same
  connection it was received from.
---

diff --git a/sbin/hammer2/msg_lnk.c b/sbin/hammer2/msg_lnk.c
index b1216e7..1c0ab69 100644
--- a/sbin/hammer2/msg_lnk.c
+++ b/sbin/hammer2/msg_lnk.c
@@ -819,6 +819,13 @@ hammer2_relay_scan_specific(h2span_node_t *node, h2span_connect_t *conn)
 			 * we can break out of the loop.
 			 */
 			break;
+		} else if (slink->state->iocom == conn->state->iocom) {
+			/*
+			 * No match but we would transmit a LNK_SPAN
+			 * out the same connection it came in on, which
+			 * can be trivially optimized out.
+			 */
+			break;
 		} else {
 			/*
 			 * No match, distance is ok, construct a new relay.