Name
xprt_adjust_cwnd —
adjust transport congestion window
Synopsis
void xprt_adjust_cwnd ( | struct rpc_task * task, |
| int result) ; |
Arguments
task
recently completed RPC request used to adjust window
result
result code of completed RPC request
Description
The transport code maintains an estimate on the maximum number of out-
standing RPC requests, using a smoothed version of the congestion
avoidance implemented in 44BSD. This is basically the Van Jacobson
congestion algorithm
If a retransmit occurs, the congestion window is
halved; otherwise, it is incremented by 1/cwnd when
- a reply is received and
- a full number of requests are outstanding and
- the congestion window hasn't been updated recently.