Author: rscheff Date: Thu Apr 30 21:16:08 2020 New Revision: 360510 URL: https://svnweb.freebsd.org/changeset/base/360510
Log: MFC r360010: Reduce the delayed ACK timeout from 100ms 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: stable/12/share/man/man7/tuning.7 stable/12/sys/netinet/tcp_timer.h Directory Properties: stable/12/ (props changed) Modified: stable/12/share/man/man7/tuning.7 ============================================================================== --- stable/12/share/man/man7/tuning.7 Thu Apr 30 21:09:01 2020 (r360509) +++ stable/12/share/man/man7/tuning.7 Thu Apr 30 21:16:08 2020 (r360510) @@ -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: stable/12/sys/netinet/tcp_timer.h ============================================================================== --- stable/12/sys/netinet/tcp_timer.h Thu Apr 30 21:09:01 2020 (r360509) +++ stable/12/sys/netinet/tcp_timer.h Thu Apr 30 21:16:08 2020 (r360510) @@ -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-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
