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| author | dillon <dillon@FreeBSD.org> | 2002-08-24 17:22:44 +0000 |
|---|---|---|
| committer | dillon <dillon@FreeBSD.org> | 2002-08-24 17:22:44 +0000 |
| commit | 25a0b2072198cf9a11b601db4a7167409d8b9c64 (patch) | |
| tree | 74b4b5806b5e5688ea27474237b6de2845e262d2 /sys/netinet/tcp_subr.c | |
| parent | 6be03c7fd1154402cb7844b27d2974232846d4a7 (diff) | |
| download | FreeBSD-src-25a0b2072198cf9a11b601db4a7167409d8b9c64.zip FreeBSD-src-25a0b2072198cf9a11b601db4a7167409d8b9c64.tar.gz | |
Correct bug in t_bw_rtttime rollover, #undef USERTT
Diffstat (limited to 'sys/netinet/tcp_subr.c')
| -rw-r--r-- | sys/netinet/tcp_subr.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c index 45e5026..fed7471 100644 --- a/sys/netinet/tcp_subr.c +++ b/sys/netinet/tcp_subr.c @@ -1628,6 +1628,9 @@ tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq) * that is not using all available bandwidth, but for now our * slop will ramp us up if this case occurs and the bandwidth later * increases. + * + * Note: if ticks rollover 'bw' may wind up negative. We must + * effectively reset t_bw_rtttime for this case. */ save_ticks = ticks; if ((u_int)(save_ticks - tp->t_bw_rtttime) < 1) @@ -1637,7 +1640,7 @@ tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq) (save_ticks - tp->t_bw_rtttime); tp->t_bw_rtttime = save_ticks; tp->t_bw_rtseq = ack_seq; - if (tp->t_bw_rtttime == 0) + if (tp->t_bw_rtttime == 0 || (int)bw < 0) return; bw = ((int64_t)tp->snd_bandwidth * 15 + bw) >> 4; @@ -1666,6 +1669,7 @@ tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq) */ #define USERTT ((tp->t_srtt + tp->t_rttbest) / 2) bwnd = (int64_t)bw * USERTT / (hz << TCP_RTT_SHIFT) + 2 * tp->t_maxseg; +#undef USERTT if (tcp_inflight_debug > 0) { static int ltime; |
