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In the PRU_RCVD entry point, if TF_DELACK is set, don't send the window 

update now, since it will be sent within 200ms when the delayed ACK is
sent.  Instrument how many hits we get on this optimization.
This commit is contained in:
thorpej 1997-12-11 06:53:06 +00:00
parent 7f7bb7db17
commit 3026b32ab3
2 changed files with 11 additions and 2 deletions
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10
sys/netinet/tcp_usrreq.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: tcp_usrreq.c,v 1.28 1997/11/08 02:35:26 kml Exp $ */
/* $NetBSD: tcp_usrreq.c,v 1.29 1997/12/11 06:53:06 thorpej Exp $ */
/*
* Copyright (c) 1982, 1986, 1988, 1993
@ -251,6 +251,14 @@ tcp_usrreq(so, req, m, nam, control, p)
* After a receive, possibly send window update to peer.
*/
case PRU_RCVD:
/*
* Don't send a window update if we're about to send
* a delayed ACK; we'll be able to piggyback.
*/
if (tp->t_flags & TF_DELACK) {
tcpstat.tcps_delwin++;
break;
}
(void) tcp_output(tp);
break;

3
sys/netinet/tcp_var.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: tcp_var.h,v 1.27 1997/12/10 01:58:08 thorpej Exp $ */
/* $NetBSD: tcp_var.h,v 1.28 1997/12/11 06:53:07 thorpej Exp $ */
/*
* Copyright (c) 1982, 1986, 1993, 1994
@ -229,6 +229,7 @@ struct tcpstat {
u_long tcps_keepdrops; /* connections dropped in keepalive */
u_long tcps_connsdrained; /* connections drained due to memory
shortage */
u_long tcps_delwin; /* window updates delayed */
u_long tcps_sndtotal; /* total packets sent */
u_long tcps_sndpack; /* data packets sent */