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| author | Michael Tuexen <tuexen@FreeBSD.org> | 2019-01-24 16:40:14 +0000 |
|---|---|---|
| committer | Michael Tuexen <tuexen@FreeBSD.org> | 2019-01-24 16:40:14 +0000 |
| commit | 34bb795ba17ff58ebeec220e0b33068ac25592c8 (patch) | |
| tree | 3bb2d10f08fd7540ec3ff1d950986655552fef94 /sys/netinet | |
| parent | d81ca439e703f3ee4c83f0523aff43df9015e89d (diff) | |
| download | src-34bb795ba17ff58ebeec220e0b33068ac25592c8.tar.gz src-34bb795ba17ff58ebeec220e0b33068ac25592c8.zip | |
Update a comment to reflect the current reality.
SYN-cache entries live for abaut 12 seconds, not 45, when default
setting are used.
MFC after: 1 week
Sponsored by: Netflix, Inc.
Notes
Notes:
svn path=/head/; revision=343401
Diffstat (limited to 'sys/netinet')
| -rw-r--r-- | sys/netinet/tcp_syncache.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sys/netinet/tcp_syncache.c b/sys/netinet/tcp_syncache.c index 100229a254e8..3b4e6ff8e033 100644 --- a/sys/netinet/tcp_syncache.c +++ b/sys/netinet/tcp_syncache.c @@ -154,7 +154,12 @@ static int syncookie_cmp(struct in_conninfo *inc, struct syncache_head *sch, /* * Transmit the SYN,ACK fewer times than TCP_MAXRXTSHIFT specifies. - * 3 retransmits corresponds to a timeout of 3 * (1 + 2 + 4 + 8) == 45 seconds, + * 3 retransmits corresponds to a timeout with default values of + * TCPTV_RTOBASE * ( 1 + + * tcp_syn_backoff[1] + + * tcp_syn_backoff[2] + + * tcp_syn_backoff[3]) + 3 * tcp_rexmit_slop, + * 3000 ms * (1 + 1 + 1 + 1) + 3 * 200 ms = 12300 ms, * the odds are that the user has given up attempting to connect by then. */ #define SYNCACHE_MAXREXMTS 3 |