Issue 11
© Solarflare Communications 2014
50
Solarflare Server Adapter
User Guide
ethtool -s ethX advertise 0x20
Set autonegotiation advertised speed 10G:
ethtool -s ethX advertise 0x1000
Set autonegotiation advertised speeds 1G and 10G:
ethtool -s ethX advertise 0x1020
Identify interface auto negotiation pause frame setting:
ethtool -a ethX
Configure auto negotiation of pause frames:
ethtool -A ethX autoneg on [rx on|off] [tx on|off]
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
To change offload settings for Tx and Rx, use the ethtool command:
ethtool --offload <ethX> [rx on|off] [tx on|off]
Configuring Receive/Transmit Ring Buffer Size
By default receive and transmit ring buffers on the Solarflare adapter support 1024 descriptors. The
user can identify and reconfigure ring buffer sizes using the ethtool command.
To identify the current ring size:
ethtool -g ethX
To set the new transmit or receive ring size to value N
ethtool -G ethX [rx N| tx N]
The ring buffer size must be a value between 128 and 4096. On the SFN7000 series adapters the
maximum TX buffer size is restricted to 2048. Buffer size can also be set directly in the
modprobe.conf
file or add the options line to a file under the
/etc/modprobe.d
directory e.g.
options sfc rx_ring=4096
Using the modprobe method sets the value for all Solarflare interfaces. Then reload the driver for
the option to become effective:
modprobe -r sfc
modprobe sfc