diff --git a/share/man/man7/tuning.7 b/share/man/man7/tuning.7 index eead2a854406..6dd0b33f75f1 100644 --- a/share/man/man7/tuning.7 +++ b/share/man/man7/tuning.7 @@ -591,15 +591,18 @@ Adjusting .Va net.inet.tcp.inflight_stab is not recommended. This parameter defaults to 20, representing 2 maximal packets added -to the bandwidth delay product window calculation. The additional +to the bandwidth delay product window calculation. +The additional window is required to stabilize the algorithm and improve responsiveness to changing conditions, but it can also result in higher ping times -over slow links (though still much lower then you would get without -the inflight algorithm). In such cases you may +over slow links (though still much lower than you would get without +the inflight algorithm). +In such cases you may wish to try reducing this parameter to 15, 10, or 5, and you may also have to reduce .Va net.inet.tcp.inflight_min -(for example, to 3500) to get the desired effect. Reducing these parameters +(for example, to 3500) to get the desired effect. +Reducing these parameters should be done as a last resort only. .Pp The