General System Tuning for the NCA

In addition to setting the NCA parameters, you can do some general system tuning to benefit NCA performance. If you are using Sun GigabitEthernet (ge driver), you should set the interface in interrupt mode for better results.

For example, a system with 4 Gbytes of memory and booted under 64–bit kernel should have the following parameters set in the /etc/system file. Use pagesize to determine your system's page size.

set sq_max_size=0
set ge:ge_intr_mode=1
set nca:nca_conn_hash_size=82500
set nca:nca_conn_req_max_q=100000
set nca:nca_conn_req_max_q0=100000
set nca:nca_ppmax=393216
set nca:nca_vpmax=393216

sq_max_size

Description

The depth of the syncq (number of messages) before a destination streams queue generates a QFULL message.

Default

2 messages

Range

1 to 0 (unlimited)

Dynamic?

No

When to Change

When NCA is running on a system with a lot of memory, increase this parameter to allow drivers to queue more packets of data. If a server is under heavy load, increase this parameter so modules and drivers may process more data without dropping packets or getting backlogged.

Commitment Level

Unstable

ge:ge_intr_mode

Description

Enables the ge driver to send packets directly to the upper communication layers rather than queueing the packets.

Default

0 (queue packets to upper layers)

Range

0 (enable) to 1 (disable)

Dynamic?

No

When to Change

When NCA is enabled, set this parameter to 1 so that the packet is delivered to NCA in interrupt mode for faster processing

Commitment Level

Unstable