Intel Ethernet X520 10GbE Dual Port KX4 Mezz User Manual page 76

Parameter Name Valid
Range/Settings
LLIPort 0-65535
LLIPush 0-1
LLISize 0-1500
IntMode 0-2
RSS 0-8
Default Description
0 (dis- LLIPort configures the port for Low Latency Interrupts (LLI).
abled)
Low Latency Interrupts allow for immediate generation of an
interrupt upon processing receive packets that match certain cri-
teria as set by the parameters described below. LLI parameters
are not enabled when Legacy interrupts are used. You must be
using MSI or MSI-X (see cat /proc/interrupts) to successfully use
LLI.
For example, using LLIPort=80 would cause the board to gen-
erate an immediate interrupt upon receipt of any packet sent to
TCP port 80 on the local machine.
CAUTION: Enabling LLI can result in an excessive
number of interrupts/second that may cause problems
with the system and in some cases may cause a ker-
nel panic.
LLIPush can be set to enabled or disabled (default). It is most
0 (dis-
effective in an environment with many small transactions.
abled)
NOTE: Enabling LLIPush may allow a denial of service
attack.
0 (dis- LLISize causes an immediate interrupt if the board receives a
abled) packet smaller than the specified size.
This allows load time control over the interrupt type registered
2
by the driver. MSI-X is required for multiple queue support.
Some kernels and combinations of kernel .config options will
force a lower level of interrupt support. 'cat/proc/interrupts' will
show different values for each type of interrupt.
0 = Legacy Interrupts.
1 = MSI Interrupts.
2 = MSI-X interrupts (default).
1 0 = Assign up to whichever is less between the number of
CPUs or the number of queues.
X = Assign X queue, where X is less than or equal to the max-
imum number of queues. The driver allows maximum sup-
ported queue value. For example, I350-based adapters allow
RSS=8, where 8 is the maximum queues allowed.
NOTE: For 82575-based adapters, the maximum num-
ber of queues is 4. For 82576-based and newer
adapters, it is 8.
This parameter is also affected by the VMDQ parameter in that
it will limit the queues more.
Model
82575
82576
0 1 2 3+
4 4 3 1
8 2 2 2