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AT-29xx Series Gigabit Ethernet Network Adapters Installation Guide
79
Setting this parameter higher allows the NIC to buffer larger bursts of
network traffic without dropping frames, especially on slower systems.
Note that the driver may not be able to allocate the required amount of
memory if this parameter is set too high. This parameter should not be
set less than 50 if adaptive_coalesce (see below) is enabled.
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.