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Reduce the TCP initial retransmission timeout from 3 seconds to

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1 second as allowed by RFC 6298.

Reviewed by:		kbowling@, Richard Scheffenegger
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D18941
This commit is contained in:
Michael Tuexen 2019-02-20 18:03:43 +00:00
parent c6dcb64b18
commit 3b853844d7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=344368
2 changed files with 2 additions and 2 deletions
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2
sys/netinet/tcp_syncache.c
View File

@ -159,7 +159,7 @@ static int syncookie_cmp(struct in_conninfo *inc, struct syncache_head *sch,
* tcp_backoff[1] +
* tcp_backoff[2] +
* tcp_backoff[3]) + 3 * tcp_rexmit_slop,
* 3000 ms * (1 + 2 + 4 + 8) + 3 * 200 ms = 45600 ms,
* 1000 ms * (1 + 2 + 4 + 8) + 3 * 200 ms = 15600 ms,
* the odds are that the user has given up attempting to connect by then.
*/
#define SYNCACHE_MAXREXMTS 3

2
sys/netinet/tcp_timer.h
View File

@ -77,7 +77,7 @@
#define TCPTV_MSL ( 30*hz) /* max seg lifetime (hah!) */
#define TCPTV_SRTTBASE 0 /* base roundtrip time;
if 0, no idea yet */
#define TCPTV_RTOBASE ( 3*hz) /* assumed RTO if no info */
#define TCPTV_RTOBASE ( 1*hz) /* assumed RTO if no info */
#define TCPTV_PERSMIN ( 5*hz) /* minimum persist interval */
#define TCPTV_PERSMAX ( 60*hz) /* maximum persist interval */