Tuning Parameters for /etc/system

Table B-3TCP/IP Options

 

 

 

 

 

TCP/IP Options

Description

 

 

 

 

ndd -set /dev/tcp

The maximum value of TCP congestion window (cwnd) in bytes.

 

tcp_cwnd_max 65535

 

 

ndd -set /dev/tcp

The default minimum retransmission timeout (RTO) value in

 

tcp_rexmit_interval_min

milliseconds. The calculated RTO for all TCP connections cannot

3000

be lower than this value.

 

ndd -set /dev/tcp

The default maximum retransmission timeout value (RTO) in

 

tcp_rexmit_interval_

milliseconds. The calculated RTO for all TCP connections cannot

 

max 10000

exceed this value.

 

 

 

ndd -set /dev/tcp

The default initial retransmission timeout value (RTO) in

 

tcp_rexmit_interval_

milliseconds

 

initial 3000

 

ndd -set /dev/tcp tcp_time_wait_interv al 60000

ndd -set /dev/tcp tcp_keepalive_interv al 900000

The time in milliseconds a TCP connection stays in TIME-WAIT state. Refer to RFC 1122, 4.2.2.13 for more information.

The time in milliseconds a TCP connection stays in KEEP-ALIVE state. Refer to RFC 1122, 4.2.2.13 for more information.

ndd -set /dev/tcp tcp_conn_req_max_q <value>

ndd -set /dev/tcp tcp_conn_req_max_q0 <value>

ndd -set /dev/tcp tcp_ip_abort_interva l <value>

ndd -set /dev/tcp tcp_ip_abort_interva l <value>

The default maximum number of pending TCP connections for a TCP listener waiting to be accepted by accept(SOCKET).

The default maximum number of incomplete (three-way handshake not yet finished) pending TCP connections for a TCP listener.

Refer to RFC 793 for more information on TCP three-way handshake.

The default total retransmission timeout value for a TCP connection in milliseconds. For a given TCP connection, if TCP has been re-transmitting for tcp_ip_abort_interval period and it has not received any acknowledgment from the other endpoint during this period, TCP closes this connection.

Appendix B Analysis Tools 151

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Sun Microsystems 2005Q1 manual Max