svn commit: r360010 - in head: share/man/man7 sys/netinet
Richard Scheffenegger
rscheff at FreeBSD.org
Thu Apr 16 15:59:24 UTC 2020
Author: rscheff
Date: Thu Apr 16 15:59:23 2020
New Revision: 360010
URL: https://svnweb.freebsd.org/changeset/base/360010
Log:
Reduce default TCP delayed ACK timeout to 40ms.
Reviewed by: kbowling, tuexen
Approved by: tuexen (mentor)
MFC after: 2 weeks
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D23281
Modified:
head/share/man/man7/tuning.7
head/sys/netinet/tcp_timer.h
Modified: head/share/man/man7/tuning.7
==============================================================================
--- head/share/man/man7/tuning.7 Thu Apr 16 15:58:58 2020 (r360009)
+++ head/share/man/man7/tuning.7 Thu Apr 16 15:59:23 2020 (r360010)
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd October 30, 2017
+.Dd April 16, 2020
.Dt TUNING 7
.Os
.Sh NAME
@@ -435,7 +435,7 @@ number of tiny packets flowing across the network in h
The
.Fx
delayed ACK implementation also follows the TCP protocol rule that
-at least every other packet be acknowledged even if the standard 100ms
+at least every other packet be acknowledged even if the standard 40ms
timeout has not yet passed.
Normally the worst a delayed ACK can do is
slightly delay the teardown of a connection, or slightly delay the ramp-up
Modified: head/sys/netinet/tcp_timer.h
==============================================================================
--- head/sys/netinet/tcp_timer.h Thu Apr 16 15:58:58 2020 (r360009)
+++ head/sys/netinet/tcp_timer.h Thu Apr 16 15:59:23 2020 (r360010)
@@ -119,7 +119,7 @@
#define TCP_MAXRXTSHIFT 12 /* maximum retransmits */
-#define TCPTV_DELACK ( hz/10 ) /* 100ms timeout */
+#define TCPTV_DELACK ( hz/25 ) /* 40ms timeout */
/*
* If we exceed this number of retransmits for a single segment, we'll consider
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