Persist timers TCPTV_PERSMIN and TCPTV_PERSMAX are hardcoded with 5 seconds and
60 seconds, respectively. Turn them into sysctls that can be tuned live. The default values of 5 seconds and 60 seconds have been retained. Submitted by: Jason Wolfe (j at nitrology dot com) Reviewed by: gnn, rrs, hiren, bz MFC after: 1 week Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D5024
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fe68f570d4
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0645c6049d
sys/netinet
@ -1626,7 +1626,7 @@ tcp_setpersist(struct tcpcb *tp)
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* Start/restart persistance timer.
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*/
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TCPT_RANGESET(tt, t * tcp_backoff[tp->t_rxtshift],
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TCPTV_PERSMIN, TCPTV_PERSMAX);
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tcp_persmin, tcp_persmax);
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tcp_timer_activate(tp, TT_PERSIST, tt);
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if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
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tp->t_rxtshift++;
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@ -675,6 +675,8 @@ tcp_init(void)
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tcp_rexmit_min = TCPTV_MIN;
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if (tcp_rexmit_min < 1)
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tcp_rexmit_min = 1;
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tcp_persmin = TCPTV_PERSMIN;
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tcp_persmax = TCPTV_PERSMAX;
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tcp_rexmit_slop = TCPTV_CPU_VAR;
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tcp_finwait2_timeout = TCPTV_FINWAIT2_TIMEOUT;
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tcp_tcbhashsize = hashsize;
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@ -77,6 +77,14 @@ __FBSDID("$FreeBSD$");
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#include <netinet/tcp_debug.h>
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#endif
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int tcp_persmin;
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SYSCTL_PROC(_net_inet_tcp, OID_AUTO, persmin, CTLTYPE_INT|CTLFLAG_RW,
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&tcp_persmin, 0, sysctl_msec_to_ticks, "I", "minimum persistence interval");
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int tcp_persmax;
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SYSCTL_PROC(_net_inet_tcp, OID_AUTO, persmax, CTLTYPE_INT|CTLFLAG_RW,
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&tcp_persmax, 0, sysctl_msec_to_ticks, "I", "maximum persistence interval");
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int tcp_keepinit;
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SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit, CTLTYPE_INT|CTLFLAG_RW,
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&tcp_keepinit, 0, sysctl_msec_to_ticks, "I", "time to establish connection");
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@ -77,7 +77,7 @@
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if 0, no idea yet */
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#define TCPTV_RTOBASE ( 3*hz) /* assumed RTO if no info */
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#define TCPTV_PERSMIN ( 5*hz) /* retransmit persistence */
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#define TCPTV_PERSMIN ( 5*hz) /* minimum persist interval */
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#define TCPTV_PERSMAX ( 60*hz) /* maximum persist interval */
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#define TCPTV_KEEP_INIT ( 75*hz) /* initial connect keepalive */
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@ -173,6 +173,8 @@ struct tcp_timer {
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#define TP_KEEPCNT(tp) ((tp)->t_keepcnt ? (tp)->t_keepcnt : tcp_keepcnt)
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#define TP_MAXIDLE(tp) (TP_KEEPCNT(tp) * TP_KEEPINTVL(tp))
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extern int tcp_persmin; /* minimum persist interval */
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extern int tcp_persmax; /* maximum persist interval */
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extern int tcp_keepinit; /* time to establish connection */
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extern int tcp_keepidle; /* time before keepalive probes begin */
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extern int tcp_keepintvl; /* time between keepalive probes */
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