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Oracle Solaris Tunable Parameters Reference Manual
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Document Information

Preface

1.  Overview of Oracle Solaris System Tuning

2.  Oracle Solaris Kernel Tunable Parameters

3.  NFS Tunable Parameters

4.  Internet Protocol Suite Tunable Parameters

Where to Find Tunable Parameter Information

Overview of Tuning IP Suite Parameters

IP Suite Parameter Validation

Internet Request for Comments (RFCs)

IP Tunable Parameters

ip_icmp_err_interval and ip_icmp_err_burst

ip_respond_to_echo_broadcast and ip6_respond_to_echo_multicast

ip_send_redirects and ip6_send_redirects

ip_forward_src_routed and ip6_forward_src_routed

ip_addrs_per_if

ip_strict_dst_multihoming and ip6_strict_dst_multihoming

ip_multidata_outbound

ip_squeue_fanout

ip_soft_rings_cnt

IP Tunable Parameters With Additional Cautions

ip_ire_pathmtu_interval

ip_icmp_return_data_bytes and ip6_icmp_return_data_bytes

TCP Tunable Parameters

tcp_deferred_ack_interval

tcp_local_dack_interval

tcp_deferred_acks_max

tcp_local_dacks_max

tcp_wscale_always

tcp_tstamp_always

tcp_xmit_hiwat

tcp_recv_hiwat

tcp_max_buf

tcp_cwnd_max

tcp_slow_start_initial

tcp_slow_start_after_idle

tcp_sack_permitted

tcp_rev_src_routes

tcp_time_wait_interval

tcp_ecn_permitted

tcp_conn_req_max_q

tcp_conn_req_max_q0

tcp_conn_req_min

tcp_rst_sent_rate_enabled

tcp_rst_sent_rate

tcp_mdt_max_pbufs

TCP/IP Parameters Set in the /etc/system File

ipcl_conn_hash_size

ip_squeue_worker_wait

TCP Parameters With Additional Cautions

tcp_ip_abort_interval

tcp_rexmit_interval_initial

tcp_rexmit_interval_max

tcp_rexmit_interval_min

tcp_rexmit_interval_extra

tcp_tstamp_if_wscale

tcp_recv_hiwat_minmss

UDP Tunable Parameters

udp_xmit_hiwat

udp_recv_hiwat

UDP Parameter With Additional Caution

udp_max_buf

IPQoS Tunable Parameter

ip_policy_mask

SCTP Tunable Parameters

sctp_max_init_retr

sctp_pa_max_retr

sctp_pp_max_retr

sctp_cwnd_max

sctp_ipv4_ttl

sctp_heartbeat_interval

sctp_new_secret_interval

sctp_initial_mtu

sctp_deferred_ack_interval

sctp_ignore_path_mtu

sctp_initial_ssthresh

sctp_xmit_hiwat

sctp_xmit_lowat

sctp_recv_hiwat

sctp_max_buf

sctp_ipv6_hoplimit

sctp_rto_min

sctp_rto_max

sctp_rto_initial

sctp_cookie_life

sctp_max_in_streams

sctp_initial_out_streams

sctp_shutack_wait_bound

sctp_maxburst

sctp_addip_enabled

sctp_prsctp_enabled

Per-Route Metrics

5.  Network Cache and Accelerator Tunable Parameters

6.  System Facility Parameters

A.  Tunable Parameters Change History

B.  Revision History for This Manual

Index

IPQoS Tunable Parameter

ip_policy_mask

Description

Enables or disables IPQoS processing in any of the following callout positions: forward outbound, forward inbound, local outbound, and local inbound. This parameter is a bitmask as follows:

Not Used
Not Used
Not Used
Not Used
Forward Outbound
Forward Inbound
Local Outbound
Local Inbound
X
X
X
X
0
0
0
0

A 1 in any of the position masks or disables IPQoS processing in that particular callout position. For example, a value of 0x01 disables IPQoS processing for all the local inbound packets.

Default

The default value is 0, meaning that IPQoS processing is enabled in all the callout positions.

Range

0 (0x00) to 15 (0x0F). A value of 15 indicates that IPQoS processing is disabled in all the callout positions.

Dynamic?

Yes

When to Change

If you want to enable or disable IPQoS processing in any of the callout positions.

Commitment Level

Unstable