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head/share/man/man4/tcp.4
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| Changing the value on fly would not affect connections using congestion window | Changing the value on fly would not affect connections using congestion window | ||||
| from the hostcache. | from the hostcache. | ||||
| Caution: | Caution: | ||||
| This regulates the burst of packets allowed to be sent in the first RTT. | This regulates the burst of packets allowed to be sent in the first RTT. | ||||
| The value should be relative to the link capacity. | The value should be relative to the link capacity. | ||||
| Start with small values for lower-capacity links. | Start with small values for lower-capacity links. | ||||
| Large bursts can cause buffer overruns and packet drops if routers have small | Large bursts can cause buffer overruns and packet drops if routers have small | ||||
| buffers or the link is experiencing congestion. | buffers or the link is experiencing congestion. | ||||
| .It Va newcwd | |||||
| Enable the New Congestion Window Validation mechanism as described in RFC 7661. | |||||
| This gently reduces the congestion window during periods, where TCP is | |||||
| application limited and the network bandwidth is not utilized completely. | |||||
| That prevents self-inflicted packet losses once the application starts to | |||||
| transmit data at a higher speed. | |||||
| .It Va rfc6675_pipe | .It Va rfc6675_pipe | ||||
| Calculate the bytes in flight using the algorithm described in RFC 6675, and | Calculate the bytes in flight using the algorithm described in RFC 6675, and | ||||
| is also a prerequisite to enable Proportional Rate Reduction. | is also a prerequisite to enable Proportional Rate Reduction. | ||||
| .It Va rfc3042 | .It Va rfc3042 | ||||
| Enable the Limited Transmit algorithm as described in RFC 3042. | Enable the Limited Transmit algorithm as described in RFC 3042. | ||||
| It helps avoid timeouts on lossy links and also when the congestion window | It helps avoid timeouts on lossy links and also when the congestion window | ||||
| is small, as happens on short transfers. | is small, as happens on short transfers. | ||||
| .It Va rfc3390 | .It Va rfc3390 | ||||
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