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From: Sebastian Huber <>
Subject: [newlib-cygwin] tcp: SACK Lost Retransmission Detection (LRD)
Date: Mon, 11 Jul 2022 11:54:35 +0000 (GMT)	[thread overview]
Message-ID: <> (raw);h=d4971b646486da73e4213010115e8aa0573e389a

commit d4971b646486da73e4213010115e8aa0573e389a
Author: Richard Scheffenegger <>
Date:   Mon May 10 18:47:47 2021 +0200

    tcp: SACK Lost Retransmission Detection (LRD)
    Recover from excessive losses without reverting to a
    retransmission timeout (RTO). Disabled by default, enable
    with sysctl net.inet.tcp.do_lrd=1
    Reviewed By: #transport, rrs, tuexen, #manpages
    Sponsored by: Netapp, Inc.
    Differential Revision:

 newlib/libc/sys/rtems/include/netinet/tcp.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/newlib/libc/sys/rtems/include/netinet/tcp.h b/newlib/libc/sys/rtems/include/netinet/tcp.h
index 50f0811a6..7ba99df51 100644
--- a/newlib/libc/sys/rtems/include/netinet/tcp.h
+++ b/newlib/libc/sys/rtems/include/netinet/tcp.h
@@ -199,6 +199,7 @@ struct tcphdr {
 #define TCP_PROC_ACCOUNTING 76	/* Do accounting on tcp cpu usage and counts */
 #define TCP_USE_CMP_ACKS 77 	/* The transport can handle the Compressed mbuf acks */
 #define	TCP_PERF_INFO	78	/* retrieve accounting counters */
+#define	TCP_LRD		79	/* toggle Lost Retransmission Detection for A/B testing */
 #define	TCP_KEEPINIT	128	/* N, time to establish connection */
 #define	TCP_KEEPIDLE	256	/* L,N,X start keeplives after this period */
 #define	TCP_KEEPINTVL	512	/* L,N interval between keepalives */

                 reply	other threads:[~2022-07-11 11:54 UTC|newest]

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