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Correct formula for TCP RTO calculation. Also try to do a better job in

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filling in a new PCB's rttvar (but this is not the last word on the subject).
And get rid of `#ifdef RTV_RTT', it's been true for four years now...
This commit is contained in:
Garrett Wollman 1996-06-05 16:57:38 +00:00
parent 503a85ae94
commit 6da5712b60
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=16141
3 changed files with 7 additions and 11 deletions
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6
sys/netinet/tcp_subr.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
* $Id: tcp_subr.c,v 1.27 1996/03/22 18:11:25 wollman Exp $
* $Id: tcp_subr.c,v 1.28 1996/03/27 18:23:16 wollman Exp $
*/
#include <sys/param.h>
@ -270,7 +270,7 @@ tcp_newtcpcb(inp)
* reasonable initial retransmit time.
*/
tp->t_srtt = TCPTV_SRTTBASE;
tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << TCP_RTTVAR_SHIFT;
tp->t_rttmin = TCPTV_MIN;
TCPT_RANGESET(tp->t_rxtcur,
((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
@ -320,7 +320,6 @@ tcp_close(tp)
struct inpcb *inp = tp->t_inpcb;
struct socket *so = inp->inp_socket;
register struct mbuf *m;
#ifdef RTV_RTT
register struct rtentry *rt;
/*
@ -391,7 +390,6 @@ tcp_close(tp)
tcpstat.tcps_cachedssthresh++;
}
}
#endif /* RTV_RTT */
/* free the reassembly queue, if any */
t = tp->seg_next;
while (t != (struct tcpiphdr *)tp) {

6
sys/netinet/tcp_timewait.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
* $Id: tcp_subr.c,v 1.27 1996/03/22 18:11:25 wollman Exp $
* $Id: tcp_subr.c,v 1.28 1996/03/27 18:23:16 wollman Exp $
*/
#include <sys/param.h>
@ -270,7 +270,7 @@ tcp_newtcpcb(inp)
* reasonable initial retransmit time.
*/
tp->t_srtt = TCPTV_SRTTBASE;
tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << TCP_RTTVAR_SHIFT;
tp->t_rttmin = TCPTV_MIN;
TCPT_RANGESET(tp->t_rxtcur,
((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
@ -320,7 +320,6 @@ tcp_close(tp)
struct inpcb *inp = tp->t_inpcb;
struct socket *so = inp->inp_socket;
register struct mbuf *m;
#ifdef RTV_RTT
register struct rtentry *rt;
/*
@ -391,7 +390,6 @@ tcp_close(tp)
tcpstat.tcps_cachedssthresh++;
}
}
#endif /* RTV_RTT */
/* free the reassembly queue, if any */
t = tp->seg_next;
while (t != (struct tcpiphdr *)tp) {

6
sys/netinet/tcp_var.h
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
* $Id: tcp_var.h,v 1.31 1996/03/22 18:09:21 wollman Exp $
* $Id: tcp_var.h,v 1.32 1996/04/26 18:32:58 wollman Exp $
*/
#ifndef _NETINET_TCP_VAR_H_
@ -214,8 +214,8 @@ struct rmxp_tao {
* fast networks.
*/
#define TCP_REXMTVAL(tp) \
((((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_RTTVAR_SHIFT)) \
+ ((tp)->t_rttvar) >> TCP_RTTVAR_SHIFT))
((((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
+ (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
/* XXX
* We want to avoid doing m_pullup on incoming packets but that