From 01720bc0002a2a8af4f04d3f23a18d1743ac0fe9 Mon Sep 17 00:00:00 2001
From: Chas Williams <chas@cmf.nrl.navy.mil>
Date: Sun, 13 Aug 2006 17:43:28 +0000
Subject: [PATCH] DEVEL15-fix-congestion-tracking-20060813

FIXES 36951

fix congestion tracking


(cherry picked from commit 031c1819239b5ece45027b25283d980ddc507c93)
---
 src/rx/rx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/rx/rx.c b/src/rx/rx.c
index ff973735f..6891a2c92 100644
--- a/src/rx/rx.c
+++ b/src/rx/rx.c
@@ -3771,10 +3771,11 @@ rxi_ReceiveAckPacket(register struct rx_call *call, struct rx_packet *np,
 	 * be unable to accept packets of the size that prior AFS versions would
 	 * send without asking.  */
 	if (peer->maxMTU != tSize) {
+	    if (peer->maxMTU > tSize) /* possible cong., maxMTU decreased */
+		peer->congestSeq++;
 	    peer->maxMTU = tSize;
 	    peer->MTU = MIN(tSize, peer->MTU);
 	    call->MTU = MIN(call->MTU, tSize);
-	    peer->congestSeq++;
 	}
 
 	if (np->length == rx_AckDataSize(ap->nAcks) + 3 * sizeof(afs_int32)) {
-- 
2.39.5