Solarflare Solarflare XtremeScale series, User Manual, Page: 129 / 400

Solarflare Server Adapter User Guide
Solarflare Adapters on Linux
Issue 20 © Solarflare Communications 2017 122
Buffer Recycling Make receive buffer recycling more aggressive by
setting the following driver option (see Driver
Tuning on page 111 ):
rx_recycle_ring_size=256
PIO Disable PIO by setting the following driver option
(see Driver Tuning on page 111 ):
piobuf_size=0
Transmit push Disable transmit push by setting the following
driver option (see Driver Tuning on page 111 ):
tx_push_max_fill=0
Direct copying Disable copying directly from the network stack for
transmits by setting the following driver option (see
Driver Tuning on page 111 ):
tx_copybreak=0
Ring sizes Change the number of descriptor slots on each ring
by setting the following driver options (see Driver
Tuning on page 111 ):
tx_ring=512

rx_ring=512
Note that as the
tx_irq_mod_usec
interrupt
moderation interval increases, the number of
required
tx_ring
and
rx_ring
descriptor slots also
increases. Insufficient descriptor slots will cause
dropped packets.
Table 26: Forwarding Tuning Settings
Tuning Parameter How?