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Solarflare Server Adapter User Guide
Solarflare Adapters on Linux
Issue 20 © Solarflare Communications 2017 121
Recommended Forwarding Tuning
Table 26 shows recommended tuning settings for forwarding
Table 26: Forwarding Tuning Settings
Tuning Parameter How?
MTU Size Configure to maximum supported by network:
/sbin/ifconfig <ethX> mtu <size>
Interrupt moderation Configure an explicit interrupt moderation interval
by setting the following driver options (see Driver
Tuning on page 111 ):
irq_adapt_enable=0

tx_irq_mod_usec=150
TCP/IP Checksum Offload Leave at default (Enabled).
TCP Segmentation Offload Leave at default (Enabled).
TCP Large Receive Offload Disable using sysfs:
echo 0 > /sys/class/net/ethX/device/lro
TCP Protocol Tuning Leave at default for 2.6.16 and later kernels.
For earlier kernels:
sysctl net.core.tcp_rmem 4096 87380 524288

sysctl net.core.tcp_wmem 4096 87380 524288
Receive Side Scaling (RSS) Leave the
rss_cpus
option at the default, to use all
CPUs for RSS.
Ensure the
rss_numa_local
driver option is set to
its default value of 1 (see Driver Tuning on
page 111 ).
Interrupt affinity &
irqbalance service
Interrupt affinity. Affinitize each ethX interface to its
own CPU (if possible select CPU's on the same
Package). Refer to Interrupt Affinity on page 113 .
Stop irqbalance service:
/sbin/service irqbalance stop
Buffer Allocation Method Leave at default. Some applications may benefit
from specific setting.
The Solarflare driver now supports a single
optimized buffer allocation strategy and any value
set by the rx_alloc_method parameter is ignored.