xprt_adjust_cwnd (9) - Linux Manuals

xprt_adjust_cwnd: adjust transport congestion window

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.

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