tcp_conn_hash_size

Description

Controls the hash table size in the TCP module for all TCP connections.

Data Type

Signed integer

Default

512

Range

512 to 1,073,741,824

Implicit

The value should be a power of 2.

Dynamic?

No. The 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 2.

When to Change

If the system consistently has tens of thousands of TCP connections, increase the value accordingly. With the default value, TCP 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