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XPRT_ADJUST_CWND(9) Linux Networking XPRT_ADJUST_CWND(9)

NAME

xprt_adjust_cwnd - adjust transport congestion window

SYNOPSIS

void xprt_adjust_cwnd(struct rpc_xprt * xprt, struct rpc_task * task, int result);

ARGUMENTS

struct rpc_xprt * xprt

pointer to xprt

struct rpc_task * task

recently completed RPC request used to adjust window

int 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.

COPYRIGHT

June 2017 Kernel Hackers Manual 4.11