On 21/02/2019 5:03 am, Michael Tuexen wrote:
Author: tuexen
Date: Wed Feb 20 18:03:43 2019
New Revision: 344368
URL: https://svnweb.freebsd.org/changeset/base/344368
Log:
Reduce the TCP initial retransmission timeout from 3 seconds to
1 second as allowed by RFC 6298.
Reviewed by: kbowling@, Richard Scheffenegger
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D18941
Modified:
head/sys/netinet/tcp_syncache.c
head/sys/netinet/tcp_timer.h
Modified: head/sys/netinet/tcp_syncache.c
==============================================================================
--- head/sys/netinet/tcp_syncache.c Wed Feb 20 17:56:38 2019
(r344367)
+++ head/sys/netinet/tcp_syncache.c Wed Feb 20 18:03:43 2019
(r344368)
@@ -159,7 +159,7 @@ static int syncookie_cmp(struct in_conninfo *inc, str
* 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
Modified: head/sys/netinet/tcp_timer.h
==============================================================================
--- head/sys/netinet/tcp_timer.h Wed Feb 20 17:56:38 2019
(r344367)
+++ head/sys/netinet/tcp_timer.h Wed Feb 20 18:03:43 2019
(r344368)
@@ -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 */
_______________________________________________
Any way this can be a run-time tunable?
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