User`s guide

3: Operating the Adapter

Resetting the Adapter

In the unlikely event that you need to reset the adapter, enter the following, where N

is the adapter number:

# ifconfig ethN down

# ifconfig ethN up

Changing the Conﬁguration

To change the conﬁguration of your adapter, use the ethtool(8) command. For more

information, see the ethtool(8) man page.

Setting MTU Sizes

The maximum transmission unit (MTU) size is controlled by the mtu mtu_size switch

of the ifconfig command. The most common MTU sizes are 1500 bytes

(standard-size Ethernet frames) and 9000 (jumbo Ethernet frames). The adapter

supports an MTU size of up to 9000 bytes. Conﬁguring the adapter to use jumbo

frames can increase network throughput and reduce CPU load, but only if the

network supports jumbo frames.

By default, the Myri10GE driver conﬁgures the Myri-10G NIC with a 9000-byte MTU.

The 10-Gigabit Ethernet switch to which the NICs are connected must support jumbo

frames; otherwise, the NICs must be conﬁgured with a 1500-byte MTU.

To conﬁgure the MTU size, follow these steps:

1. To display information about the network adapters currently installed in the

system, enter the following command:

[root@linux root]# netstat -i

For example:

[root@linux root]# netstat -i

Kernel Interface table

Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg

... other interfaces removed from output

eth2 9000 053042986 0 0 073338167 0 0 0 BMRU

10 007–4983–002