[src/trunk]: src/sys/netinet Add comment urging a separation of TCP_RTT_SHIFT...

[gdt <gdt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/1bcd0ac70d8e
branches:  trunk
changeset: 765416:1bcd0ac70d8e
user:      gdt <gdt%NetBSD.org@localhost>
date:      Wed May 25 23:17:44 2011 +0000

description:
Add comment urging a separation of TCP_RTT_SHIFT into separate defines
describing the EWMA calculation and the storage representation.
(No code change.)

diffstat:

 sys/netinet/tcp_var.h |  5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diffs (19 lines):

diff -r 9f31be197d01 -r 1bcd0ac70d8e sys/netinet/tcp_var.h
--- a/sys/netinet/tcp_var.h     Wed May 25 22:58:29 2011 +0000
+++ b/sys/netinet/tcp_var.h     Wed May 25 23:17:44 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tcp_var.h,v 1.166 2011/05/03 18:28:45 dyoung Exp $     */
+/*     $NetBSD: tcp_var.h,v 1.167 2011/05/25 23:17:44 gdt Exp $        */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -571,6 +571,9 @@
  * average (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
  * This results in alpha of 0.125 and beta of 0.25, following RFC2988
  * section 2.3
+ *
+ * XXX Change SHIFT values to LGWEIGHT and REP_SHIFT, and adjust
+ * the code to use the correct ones.
  */
 #define        TCP_RTT_SHIFT           3       /* shift for srtt; 3 bits frac. */
 #define        TCP_RTTVAR_SHIFT        2       /* multiplier for rttvar; 2 bits */