How to increase sizes of buffer / ring descriptor in SecurePlatform for Broadcom NIC & Intel NIC with e1000 driver

See what the max value of the interface is, using eth0 as an example:

# ethtool -g eth0

The following is a sample output:

Ring parameters for eth0:

Pre-set maximums:
RX: 1024
RX Mini: 0
RX Jumbo: 0
TX: 1024
Current hardware settings:
RX: 256
RX Mini: 0
RX Jumbo: 0
TX: 256

In this example, 1024 is the maximum RX and TX buffer size for this particular driver, and the current buffer size is 256.



Run this command to make the change on the fly:

# ethtool -G eth0 rx 1024 tx 1024

To make the change permanent, add the following entry to the bottom of /etc/rc.d/rc.local start-up script:

ethtool -G eth0 rx 1024 tx 1024