UDP Tunable Parameters

udp_xmit_hiwat

Description

Defines the default maximum UDP socket datagram size. For more information, see udp_max_buf.

Default

57,344 bytes

Range

1,024 to 1,073,741,824 bytes

Dynamic?

Yes

When to Change

Note that an application can use setsockopt(3XNET) SO_SNDBUF to change the size for an individual socket. In general, you do not need to change the default value.

Commitment Level

Unstable

Change History

For information, see udp_xmit_hiwat (Solaris 9 Releases).

udp_recv_hiwat

Description

Defines the default maximum UDP socket receive buffer size. For more information, see udp_max_buf.

Default

57,344 bytes

Range

128 to 1,073,741,824 bytes

Dynamic?

Yes

When to Change

Note that an application can use setsockopt(3XNET) SO_RCVBUF to change the size for an individual socket. In general, you do not need to change the default value.

Commitment Level

Unstable

Change History

For information, see udp_recv_hiwat (Solaris 9 Releases).

UDP Parameter With Additional Caution

Changing the following parameter is not recommended.

udp_max_buf

Description

Controls how large send and receive buffers can be for a UDP socket.

Default

2,097,152 bytes

Range

65,536 to 1,073,741,824 bytes

Dynamic?

Yes

When to Change

Do not change the value. If this parameter is set to a very large value, UDP socket applications can consume too much memory.

Commitment Level

Unstable

Change History

For information, see udp_max_buf (Solaris 9 Releases).