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Solarflare Server Adapter User Guide
Solarflare Adapters on Linux
Issue 20 © Solarflare Communications 2017 123
3.27 Module Parameters
Table 27 lists the available parameters in the Solarflare Linux driver module
(
modinfo sfc
):
Table 27: Driver Module Parameters
Parameter Description Possible
Value
Default
Value
sxps_enabled Enable or disable the Solarflare net driver to
perform transmit flow steering.
If the kernel does support XPS, this should be
enabled in the kernel before using the SARFS
feature.
0|1 0
sarfs_table_size The size of the table used to maintain SARFS
filters.
uint 256
sarfs_global_holdoff_ms The maximum rate at which SARFS will insert
or remove filters. This can be increased on
heavily loaded servers or decreased to increase
responsiveness.
uint 10ms
sarfs_sample_rate The frequency at which TCP packets are
inspected by the SARFS feature. This can be
increased on heavily loaded servers to reduce
the CPU usage by ARFS.
Setting the sample rate to a non ‐ zero value
enables the SARFS feature. See also
sxps_enabled above.
The recommended sample rate is 20.
uint 0 packets
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 109 .
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