Solarflare Solarflare XtremeScale series, User Manual, Page: 302 / 400

Solarflare Server Adapter User Guide
Solarflare Adapters on FreeBSD
Issue 20 © Solarflare Communications 2017 295
Configuring Task Offloading
Solarflare adapters support transmit (Tx) and receive (Rx) checksum offload, as well
as TCP segmentation offload. To ensure maximum performance from the adapter,
all task offloads should be enabled, which is the default setting on the adapter. For
more information, see Performance Tuning on FreeBSD on page 305 .
Configuring Jumbo Frames
Solarflare adapters support a frame size (MTU) from 1500 bytes to 9000 bytes.
The default maximum driver MTU size is 1500 bytes. For example, to set a new
frame size (MTU) of 9000 bytes, enter the following command:
ifconfig sfxge<n> inet mtu 9000
To view the current MTU, enter:
# ifconfig sfxge<n>

sfxge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500

...
If you want to have an MTU configured when the interface is brought up, add an
mtu
parameter to the single line of interface configuration data in the
/etc/rc.conf
file. For example:
ifconfig_sfxge<n>="inet <IPv4 address> netmask <netmask> mtu <MTU size>"
6.6 Setting Up VLANs
VLANs offer a method of dividing one physical network into multiple broadcast
domains. In enterprise networks, these broadcast domains usually match with IP
subnet boundaries, so that each subnet has its own VLAN. The advantages of VLANs
include:
• Performance
• Ease of management
• Security
• Trunks
• You don't have to configure any hardware device, when physically moving your
server to another location.
To have a single interface exist on multiple VLANs (if the port on the connected
switch is set to “trunked” mode) see the following documentation:
http://people.freebsd.org/~arved/vlan/vlan_en.html