From: Randall Stewart <r...@freebsd.org>

TCP Hystart draft version -03:
https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-hystartplusplus

Is a new version of hystart that allows one to carefully exit slow start if the 
RTT
spikes too much. The newer version has a slower-slow-start so to speak that then
kicks in for five round trips. To see if you exited too early, if not into 
congestion avoidance.
This commit will add that feature to our newreno CC and add the needed bits in 
rack to
be able to enable it.

Reviewed by: tuexen
Sponsored by: Netflix Inc.
Differential Revision:  https://reviews.freebsd.org/D32373
---
 newlib/libc/sys/rtems/include/netinet/tcp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/newlib/libc/sys/rtems/include/netinet/tcp.h 
b/newlib/libc/sys/rtems/include/netinet/tcp.h
index 29c1e376c..e7c47e85b 100644
--- a/newlib/libc/sys/rtems/include/netinet/tcp.h
+++ b/newlib/libc/sys/rtems/include/netinet/tcp.h
@@ -310,7 +310,7 @@ struct tcphdr {
 #define TCP_RACK_PACING_BETA_ECN 1139  /* Changing the beta for ecn with 
pacing */
 #define TCP_RACK_TIMER_SLOP 1140       /* Set or get the timer slop used */
 #define TCP_RACK_DSACK_OPT 1141                /* How do we setup rack timer 
DSACK options bit 1/2 */
-
+#define TCP_RACK_ENABLE_HYSTART 1142   /* Do we allow hystart in the CC 
modules */
 /* Start of reserved space for third-party user-settable options. */
 #define        TCP_VENDOR      SO_VENDOR
 
-- 
2.35.3

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