Name
xprt_adjust_cwnd —
adjust transport congestion window
Synopsis
void xprt_adjust_cwnd ( | struct rpc_xprt * xprt, |
| | struct rpc_task * task, |
| | int result); |
Arguments
xprt
pointer to xprt
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.