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AT-2900 Series Gigabit Ethernet Network Adapters Installation Guide
81
rx_jumbo_desc_cnt
Configures the number of receive descriptors for jumbo frames
larger than 1528 bytes. The default is 128 and the valid range is
from 1 to 255. When jumbo frames larger than 1528 bytes are
used, do not set this parameter to lower than 60 on systems with
high network traffic. Setting this parameter higher allows the NIC to
buffer larger bursts of jumbo traffic without dropping frames,
especially on slower systems. Depending on kernel and system
architecture, the driver may require up to 268 bytes per descriptor.
Note that each descriptor also requires a buffer the size of a
maximum jumbo frame. On systems with insufficient memory, it
may be necessary to reduce this parameter. This parameter should
not be set to less than 50 if adaptive_coalesce (see below) is
enabled. When the maximum frame size is less than 1528 (MTU
size less than 1514), this parameter is not used and is always 0.
adaptive_coalesce
Enables or disables adaptive adjustments to the various interrupt
coalescing parameters. Enabling it allows the driver to dynamically
adjust the interrupt coalescing parameters to achieve high
throughput during heavy traffic and low latency during light traffic.
Do not set rx_std_desc_cnt (and rx_jumbo_desc_cnt if using
jumbo frames) to less than 50. Also, do not set tx_pkt_desc_cnt to
less than 80 when this parameter is enabled. Choose from the
following selections:
– 0 - disabled
– 1 - enabled (default)
rx_coalesce_ticks
Configures the number of 1 usec ticks before the NIC generates
receive interrupt after receiving a frame. This parameter works in
conjunction with the rx_max_coalesce_frames parameter. Interrupt
is generated when either of these thresholds is exceeded. A value
of 0 means this parameter is ignored and an interrupt is generated
when the rx_max_coalesce_frames threshold is reached. The valid
range is from 0 to 500 and default is 80. This parameter is not used
and is adjusted automatically if adaptive_coalesce is set to 1.
rx_max_coalesce_frames
Configures the number of received frames before the NIC
generates receive interrupt. The valid range is from 0 to 100 and
the default is 15. This parameter and rx_coalesce_ticks cannot
both have a value of 0. If both parameters are set to 0, no receive
interrupts are generated. It should also be set significantly lower
than rx_std_desc_cnt (and rx_jumbo_desc_cnt if using jumbo
frames). This parameter is not used and is adjusted automatically if
adaptive_coalesce is set to 1.