svn commit: r347080 - stable/12/sys/netinet
Michael Tuexen
tuexen at FreeBSD.org
Sat May 4 09:01:57 UTC 2019
Author: tuexen
Date: Sat May 4 09:01:56 2019
New Revision: 347080
URL: https://svnweb.freebsd.org/changeset/base/347080
Log:
MFC r343401:
Update a comment to reflect the current reality.
SYN-cache entries live for abaut 12 seconds, not 45, when default
setting are used.
MFC r343402:
Kill a trailing whitespace character...
MFC r343403:
Get the arithmetic right...
Sponsored by: Netflix, Inc.
Modified:
stable/12/sys/netinet/tcp_syncache.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/netinet/tcp_syncache.c
==============================================================================
--- stable/12/sys/netinet/tcp_syncache.c Sat May 4 02:45:24 2019 (r347079)
+++ stable/12/sys/netinet/tcp_syncache.c Sat May 4 09:01:56 2019 (r347080)
@@ -154,7 +154,12 @@ static int syncookie_cmp(struct in_conninfo *inc, str
/*
* 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 = 12600 ms,
* the odds are that the user has given up attempting to connect by then.
*/
#define SYNCACHE_MAXREXMTS 3
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