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tcp: remove unused t_rttbest

Browse source 
No functional change intended.

Reviewed by:		rscheff@
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D37401
This commit is contained in:
Michael Tuexen 2022-11-16 11:22:13 +01:00
parent 7ad9aa0b93
commit bd4f986644
5 changed files with 2 additions and 15 deletions
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4
sys/netinet/tcp_input.c
View file

@ -377,7 +377,6 @@ cc_conn_init(struct tcpcb *tp)
if (tp->t_srtt == 0 && (rtt = metrics.rmx_rtt)) {
tp->t_srtt = rtt;
tp->t_rttbest = tp->t_srtt + TCP_RTT_SCALE;
TCPSTAT_INC(tcps_usedrtt);
if (metrics.rmx_rttvar) {
tp->t_rttvar = metrics.rmx_rttvar;
@ -3634,8 +3633,6 @@ tcp_xmit_timer(struct tcpcb *tp, int rtt)
delta -= tp->t_rttvar >> (TCP_RTTVAR_SHIFT - TCP_DELTA_SHIFT);
if ((tp->t_rttvar += delta) <= 0)
tp->t_rttvar = 1;
if (tp->t_rttbest > tp->t_srtt + tp->t_rttvar)
tp->t_rttbest = tp->t_srtt + tp->t_rttvar;
} else {
/*
* No rtt measurement yet - use the unsmoothed rtt.
@ -3644,7 +3641,6 @@ tcp_xmit_timer(struct tcpcb *tp, int rtt)
*/
tp->t_srtt = rtt << TCP_RTT_SHIFT;
tp->t_rttvar = rtt << (TCP_RTTVAR_SHIFT - 1);
tp->t_rttbest = tp->t_srtt + tp->t_rttvar;
}
tp->t_rtttime = 0;
tp->t_rxtshift = 0;

3
sys/netinet/tcp_stacks/bbr.c
View file

@ -6384,8 +6384,6 @@ tcp_bbr_xmit_timer_commit(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts)
tp->t_rttvar += delta;
if (tp->t_rttvar <= 0)
tp->t_rttvar = 1;
if (tp->t_rttbest > tp->t_srtt + tp->t_rttvar)
tp->t_rttbest = tp->t_srtt + tp->t_rttvar;
} else {
/*
* No rtt measurement yet - use the unsmoothed rtt. Set the
@ -6394,7 +6392,6 @@ tcp_bbr_xmit_timer_commit(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts)
*/
tp->t_srtt = rtt_ticks << TCP_RTT_SHIFT;
tp->t_rttvar = rtt_ticks << (TCP_RTTVAR_SHIFT - 1);
tp->t_rttbest = tp->t_srtt + tp->t_rttvar;
}
KMOD_TCPSTAT_INC(tcps_rttupdated);
tp->t_rttupdated++;

3
sys/netinet/tcp_stacks/rack.c
View file

@ -7711,8 +7711,6 @@ tcp_rack_xmit_timer_commit(struct tcp_rack *rack, struct tcpcb *tp)
tp->t_rttvar += (delta >> 3);
if (tp->t_rttvar <= 0)
tp->t_rttvar = 1;
if (tp->t_rttbest > tp->t_srtt + tp->t_rttvar)
tp->t_rttbest = tp->t_srtt + tp->t_rttvar;
} else {
/*
* No rtt measurement yet - use the unsmoothed rtt. Set the
@ -7721,7 +7719,6 @@ tcp_rack_xmit_timer_commit(struct tcp_rack *rack, struct tcpcb *tp)
*/
tp->t_srtt = rtt;
tp->t_rttvar = rtt >> 1;
tp->t_rttbest = tp->t_srtt + tp->t_rttvar;
}
rack->rc_srtt_measure_made = 1;
KMOD_TCPSTAT_INC(tcps_rttupdated);

5
sys/netinet/tcp_usrreq.c
View file

@ -3131,9 +3131,8 @@ db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
db_print_indent(indent);
db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u "
"t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
tp->t_rttbest);
db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u\n",
tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin);
db_print_indent(indent);
db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n",

2
sys/netinet/tcp_var.h
View file

@ -213,8 +213,6 @@ struct tcpcb {
int t_blackhole_exit; /* when to exit blackhole detection */
u_int t_rttmin; /* minimum rtt allowed */
u_int t_rttbest; /* best rtt we've seen */
int t_softerror; /* possible error not yet reported */
uint32_t max_sndwnd; /* largest window peer has offered */
/* Cache line 5 */