ipc_tcp_conn_hash_size

Description

Controls the hash table size in an IP module for all active (in ESTABLISHED state) TCP connections.

Data Type

Unsigned integer

Default

512

Range

512 to 2,147,483,648

Implicit

It should be a power of two.

Dynamic?

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

Validation

If you set the parameter to a value that is not a power of 2, it is rounded up to the nearest power of two.

When to Change

If the system consistently has tens of thousands of active TCP connections, increase the value accordingly. With the default value, the system performs well up to a few thousand active connections. Note that increasing the hash table size means more memory consumption so set an appropriate value to avoid wasting memory unnecessarily.

Commitment Level

Unstable