diff options
| author | David Greenman <dg@FreeBSD.org> | 1995-07-23 05:04:31 +0000 |
|---|---|---|
| committer | David Greenman <dg@FreeBSD.org> | 1995-07-23 05:04:31 +0000 |
| commit | 57e3c392b5ebd2d62b49bc6554e7d6e3d9915807 (patch) | |
| tree | b4964b70beb69307a8e50f30ffba120a6be91add /sys/netinet | |
| parent | d690cfb3d8d7927993ba9b6a4e35c473cd622eb6 (diff) | |
Notes
Diffstat (limited to 'sys/netinet')
| -rw-r--r-- | sys/netinet/tcp_subr.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c index 381824de0eb5..09b148cc5b08 100644 --- a/sys/netinet/tcp_subr.c +++ b/sys/netinet/tcp_subr.c @@ -31,7 +31,7 @@ * SUCH DAMAGE. * * @(#)tcp_subr.c 8.1 (Berkeley) 6/10/93 - * $Id: tcp_subr.c,v 1.10 1995/04/09 01:29:26 davidg Exp $ + * $Id: tcp_subr.c,v 1.11 1995/05/30 08:09:58 rgrimes Exp $ */ #include <sys/param.h> @@ -303,18 +303,17 @@ tcp_close(tp) register struct rtentry *rt; /* - * If we sent enough data to get some meaningful characteristics, - * save them in the routing entry. 'Enough' is arbitrarily - * defined as the sendpipesize (default 4K) * 16. This would - * give us 16 rtt samples assuming we only get one sample per - * window (the usual case on a long haul net). 16 samples is - * enough for the srtt filter to converge to within 5% of the correct - * value; fewer samples and we could save a very bogus rtt. + * If we got enough samples through the srtt filter, + * save the rtt and rttvar in the routing entry. + * 'Enough' is arbitrarily defined as the 16 samples. + * 16 samples is enough for the srtt filter to converge + * to within 5% of the correct value; fewer samples and + * we could save a very bogus rtt. * * Don't update the default route's characteristics and don't * update anything that the user "locked". */ - if (SEQ_LT(tp->iss + so->so_snd.sb_hiwat * 16, tp->snd_max) && + if (tp->t_rttupdated >= 16 && (rt = inp->inp_route.ro_rt) && ((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr != INADDR_ANY) { register u_long i = 0; @@ -333,6 +332,7 @@ tcp_close(tp) (rt->rt_rmx.rmx_rtt + i) / 2; else rt->rt_rmx.rmx_rtt = i; + tcpstat.tcps_cachedrtt++; } if ((rt->rt_rmx.rmx_locks & RTV_RTTVAR) == 0) { i = tp->t_rttvar * @@ -342,6 +342,7 @@ tcp_close(tp) (rt->rt_rmx.rmx_rttvar + i) / 2; else rt->rt_rmx.rmx_rttvar = i; + tcpstat.tcps_cachedrttvar++; } /* * update the pipelimit (ssthresh) if it has been updated @@ -366,6 +367,7 @@ tcp_close(tp) (rt->rt_rmx.rmx_ssthresh + i) / 2; else rt->rt_rmx.rmx_ssthresh = i; + tcpstat.tcps_cachedssthresh++; } } #endif /* RTV_RTT */ |