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I don't know how the minimum retransmit timeout managed to get set to

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one second but it badly breaks throughput on networks with minor packet
loss.

Complaints by: at least two people tracked down to this.
MFC after:	3 days
This commit is contained in:
Matthew Dillon 2002-07-17 23:32:03 +00:00
parent 3aabf3e27d
commit 22fd54d461
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=100270
1 changed files with 7 additions and 1 deletions
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8
sys/netinet/tcp_timer.h
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@ -90,7 +90,13 @@
#define TCPTV_KEEPINTVL ( 75*hz) /* default probe interval */
#define TCPTV_KEEPCNT 8 /* max probes before drop */
#define TCPTV_MIN ( 1*hz) /* minimum allowable value */
/*
* Minimum retransmit timer is 3 ticks, for algorithmic stability.
* The maximum is 64 seconds. The prior minimum of 1*hz (1 second) badly
* breaks throughput on any networks faster then a modem that has minor
* (e.g. 1%) packet loss.
*/
#define TCPTV_MIN ( 3 ) /* minimum allowable value */
#define TCPTV_REXMTMAX ( 64*hz) /* max allowable REXMT value */
#define TCPTV_TWTRUNC 8 /* RTO factor to truncate TW */