HP-UX TCP/IP Performance White Paper, March 2008

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Tunable Name Description Reference
tcp_rexmit_interval_max Upper limit for computed round trip timeout Appendix A
tcp_rexmit_interval_min Lower limit for computed round trip timeout 4.3.1
Appendix A
tcp_sack_enable Enable TCP Selective Acknowledgement (RFC
2018)
2.2
tcp_smoothed_rtt An alternate method for computing round trip
time
Appendix A
tcp_sth_rcv_hiwat Sets the flow control high water mark
tcp_sth_rcv_lowat Sets the flow control low water mark
tcp_syn_rcvd_max Controls the SYN attack defense of TCP Appendix A
tcp_status Get netstat-like TCP instances information
tcp_time_wait_interval How long a connection persists in TIME_WAIT 4.1.1.1
tcp_ts_enable Enable TCP timestamp option
tcp_tw_cleanup_interval TIME_WAIT timeout expiration checking interval
tcp_xmit_hiwater_def The amount of unsent data that triggers TCP
flow control
2.1
4.1.1.3
4.1.2.1
5.3
tcp_xmit_hiwater_lfp The amount of unsent data that triggers TCP
flow control for fast links
5.3
tcp_xmit_hiwater_lnp The amount of unsent data that triggers TCP
flow control for slow links
5.3
tcp_xmit_hiwater_max Upper bound on TCP send buffer 5.3
tcp_xmit_lowater_def The amount of unsent data that relieves TCP
flow control
5.3
tcp_xmit_lowater_lfp The amount of unsent data that relieves TCP
flow control for fast links
5.3
tcp_xmit_lowater_lnp The amount of unsent data that relieves TCP
flow control for slow links
5.3
IPv4:
ip_def_ttl Controls the default TTL in the IP header
ip_forward_directed_broadcasts Controls subnet broadcasts packets
ip_forward_src_routed Controls forwarding of source routed packets
ip_forwarding Controls how IP hosts forward packets Appendix A
ip_fragment_timeout Controls how long IP fragments are kept
ip_ill_status Displays a report of all physical interfaces
ip_ipif_status Displays a report of all logical interfaces
ip_ire_hash Displays all routing table entries, in the order