svn commit: r332828 - stable/11/sys/netinet

[Jonathan T. Looney]

Author: jtl
Date: Fri Apr 20 15:41:33 2018
New Revision: 332828
URL: https://svnweb.freebsd.org/changeset/base/332828

Log:
  MFC r306768:
    If the new window size is less than the old window size, skip the
    calculations to check if we should advertise a larger window.

Modified:
  stable/11/sys/netinet/tcp_output.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/netinet/tcp_output.c
==============================================================================
--- stable/11/sys/netinet/tcp_output.c	Fri Apr 20 15:35:58 2018	(r332827)
+++ stable/11/sys/netinet/tcp_output.c	Fri Apr 20 15:41:33 2018	(r332828)
@@ -677,10 +677,11 @@ after_sack_rexmit:
 			oldwin = 0;
 
 		/* 
-		 * If the new window size ends up being the same as the old
-		 * size when it is scaled, then don't force a window update.
+		 * If the new window size ends up being the same as or less
+		 * than the old size when it is scaled, then don't force
+		 * a window update.
 		 */
-		if (oldwin >> tp->rcv_scale == (adv + oldwin) >> tp->rcv_scale)
+		if (oldwin >> tp->rcv_scale >= (adv + oldwin) >> tp->rcv_scale)
 			goto dontupdate;
 
 		if (adv >= (long)(2 * tp->t_maxseg) &&