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 _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
