Solarflare SFA6902F, User Manual, Page: 104 / 375

Issue 11 © Solarflare Communications 2014 99
Solarflare Server Adapter
User Guide
3.21 Module Parameters
Table 25 lists the available parameters in the Solarflare Linux driver module (
modinfo sfc
):
Table 25: Driver Module Parameters
Parameter Description
Possible
Value Default
Value
piobuf_size Identify the largest packet size that can
use PIO.
Setting this to zero effectively disables
PIO
uint 256 bytes
rx_alloc_method Allocation method used for RX buffers.
The Solarflare driver now supports a
single optimized buffer allocation
strategy and any value set by the
rx_alloc_method parameter is ignored.
See “Buffer Allocation Method” on
page 94.
uint AVN(0)
new
kernels.
PAGE(2)
old
kernels
rx_refill_threshold RX descriptor ring fast/slow fill threshold
(%). uint 90
lro_table_size
1 Size of the LRO hash table. Must be a
power of 2. uint 128
lro_chain_max
1 Maximum length of chains in the LRO
hash table. uint 20
lro_idle_jiffies
1 Time (in jiffies) after which an idle
connection's LRO state is discarded. uint 101
lro_slow_start_packets
1 Number of packets that must pass in-
order before starting LRO. uint 20000
lro_loss_packets
1 Number of packets that must pass in-
order following loss before restarting
LRO. uint 20
rx_desc_cache_size Set RX descriptor cache size. int 64
tx_desc_cache_size Set TX descriptor cache size. int 16
rx_xoff_thresh_bytes RX fifo XOFF threshold. int -1 (auto)
rx_xon_thresh_bytes RX fifo XON threshold. int -1 (auto)
lro Large receive offload acceleration int 1
separate_tx_channels Use separate channels for TX and RX uint 0