diff options
| author | dillon <dillon@FreeBSD.org> | 2002-08-17 18:26:02 +0000 |
|---|---|---|
| committer | dillon <dillon@FreeBSD.org> | 2002-08-17 18:26:02 +0000 |
| commit | bb806c49bfead601a2b3c7298f33acef7d26a4ef (patch) | |
| tree | 81ede6b84903af3b1f395ea052e7ad5eeb1fce0c /sys/netinet/tcp_var.h | |
| parent | f31168aa75e2bc569ba987f85d994af3c2662ccb (diff) | |
| download | FreeBSD-src-bb806c49bfead601a2b3c7298f33acef7d26a4ef.zip FreeBSD-src-bb806c49bfead601a2b3c7298f33acef7d26a4ef.tar.gz | |
Implement TCP bandwidth delay product window limiting, similar to (but
not meant to duplicate) TCP/Vegas. Add four sysctls and default the
implementation to 'off'.
net.inet.tcp.inflight_enable enable algorithm (defaults to 0=off)
net.inet.tcp.inflight_debug debugging (defaults to 1=on)
net.inet.tcp.inflight_min minimum window limit
net.inet.tcp.inflight_max maximum window limit
MFC after: 1 week
Diffstat (limited to 'sys/netinet/tcp_var.h')
| -rw-r--r-- | sys/netinet/tcp_var.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h index 51f9ae0..10355a6 100644 --- a/sys/netinet/tcp_var.h +++ b/sys/netinet/tcp_var.h @@ -124,10 +124,12 @@ struct tcpcb { u_long snd_wnd; /* send window */ u_long snd_cwnd; /* congestion-controlled window */ + u_long snd_bwnd; /* bandwidth-controlled window */ u_long snd_ssthresh; /* snd_cwnd size threshold for * for slow start exponential to * linear switch */ + u_long snd_bandwidth; /* calculated bandwidth or 0 */ tcp_seq snd_recover; /* for use in fast recovery */ u_int t_maxopd; /* mss plus options */ @@ -137,6 +139,9 @@ struct tcpcb { int t_rtttime; /* round trip time */ tcp_seq t_rtseq; /* sequence number being timed */ + int t_bw_rtttime; /* used for bandwidth calculation */ + tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ + int t_rxtcur; /* current retransmit value (ticks) */ u_int t_maxseg; /* maximum segment size */ int t_srtt; /* smoothed round-trip time */ @@ -144,6 +149,7 @@ struct tcpcb { int t_rxtshift; /* log(2) of rexmt exp. backoff */ u_int t_rttmin; /* minimum rtt allowed */ + u_int t_rttbest; /* best rtt we've seen */ u_long t_rttupdated; /* number of times rtt sampled */ u_long max_sndwnd; /* largest window peer has offered */ @@ -473,6 +479,7 @@ void tcp_fillheaders(struct tcpcb *, void *, void *); struct tcpcb * tcp_timers(struct tcpcb *, int); void tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); +void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); void syncache_init(void); void syncache_unreach(struct in_conninfo *, struct tcphdr *); int syncache_expand(struct in_conninfo *, struct tcphdr *, |
