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Back out a change made some time ago, that would cause the NetBSD TCP 

to ACK immediately any packet that arrived with PSH set.  This breaks
delayed ACKs in a few specific common cases that delayed ACKs were
supposed to help, and ends up not making much (if any) difference in
the case where where this ACK-on-PSH change was supposed to help.

Per discussion with several members of the TCPIMPL and TCPSAT IETF
working groups.
This commit is contained in:
thorpej 1998-03-31 23:44:09 +00:00
parent 2da6c91259
commit 1b176d9395
1 changed files with 3 additions and 5 deletions
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8
sys/netinet/tcp_input.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: tcp_input.c,v 1.46 1998/03/31 22:49:09 thorpej Exp $ */
/* $NetBSD: tcp_input.c,v 1.47 1998/03/31 23:44:09 thorpej Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@ -149,13 +149,11 @@ extern u_long sb_max;
/*
* Macro to compute ACK transmission behavior. Delay the ACK unless
* the other side PUSH'd or we have already delayed an ACK (must send
* an ACK every two segments).
* we have already delayed an ACK (must send an ACK every two segments).
*/
#define TCP_SETUP_ACK(tp, ti) \
do { \
if ((ti)->ti_flags & TH_PUSH || \
(tp)->t_flags & TF_DELACK) \
if ((tp)->t_flags & TF_DELACK) \
tp->t_flags |= TF_ACKNOW; \
else \
TCP_SET_DELACK(tp); \