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| author | Richard Scheffenegger <rscheff@FreeBSD.org> | 2023-01-26 17:07:11 +0000 |
|---|---|---|
| committer | Richard Scheffenegger <rscheff@FreeBSD.org> | 2023-01-26 17:08:00 +0000 |
| commit | 18b83b626a4f596f1686140b99473125be9e33bf (patch) | |
| tree | 5a675183207121713918a9526e513e98ca59b99f /sys/netinet/tcp_input.c | |
| parent | 7a78ae88659e0f6a901574d17672d1ccdc3e971b (diff) | |
| download | src-18b83b626a4f596f1686140b99473125be9e33bf.tar.gz src-18b83b626a4f596f1686140b99473125be9e33bf.zip | |
tcp: reduce the size of t_rttupdated in tcpcb
During tcp session start, various mechanisms need to
track a few initial RTTs before becoming active.
Prevent overflows of the corresponding tracking counter
and reduce the size of tcpcb simultaneously.
Reviewed By: #transport, tuexen, guest-ccui
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D21117
Diffstat (limited to 'sys/netinet/tcp_input.c')
| -rw-r--r-- | sys/netinet/tcp_input.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index 606f6649d73d..72faf53299e4 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -3537,7 +3537,8 @@ tcp_xmit_timer(struct tcpcb *tp, int rtt) INP_WLOCK_ASSERT(tptoinpcb(tp)); TCPSTAT_INC(tcps_rttupdated); - tp->t_rttupdated++; + if (tp->t_rttupdated < UCHAR_MAX) + tp->t_rttupdated++; #ifdef STATS stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rtt * 1000 / hz)); |