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

The following parameters can be set only in the /etc/system file. After the file is modified, reboot the system.

For example, the following entry sets the ipcl_conn_hash_size parameter:

set ip:ipcl_conn_hash_sizes=value

ipcl_conn_hash_size

Description

Controls the size of the connection hash table used by IP. The default value of 0 means that the system automatically sizes an appropriate value for this parameter at boot time, depending on the available memory.

Data Type

Unsigned integer

Default

0

Range

0 to 82,500

Dynamic?

No. The parameter can only be changed at boot time.

When to Change

If the system consistently has tens of thousands of TCP connections, the value can be increased accordingly. Increasing the hash table size means that more memory is wired down, thereby reducing available memory to user applications.

Commitment Level

Unstable

ip_squeue_worker_wait

Description

Governs the maximum delay in waking up a worker thread to process TCP/IP packets that are enqueued on an squeue. An squeue is a serialization queue that is used by the TCP/IP kernel code to process TCP/IP packets.

Default

10 milliseconds

Range

0 – 50 milliseconds

Dynamic?

Yes

When to Change

Consider tuning this parameter if latency is an issue, and network traffic is light. For example, if the machine serves mostly interactive network traffic.

The default value usually works best on a network file server, a web server, or any server that has substantial network traffic.

Zone Configuration

This parameter can only be set in the global zone.

Commitment Level

Unstable

Change History

For information, see ip_squeue_worker_wait (Solaris 10 11/06 Release).