Dell Intel PRO Family of Adapters - Manual (Page 52)

NOTE: A higher ITR rate also means that the driver has more latency in handling packets. If the adapter is hand-
ling many small packets, it is better to lower the ITR so that the driver can be more responsive to incoming and
outgoing packets.
Altering this setting may improve traffic throughput for certain network and system configurations, however the default
setting is optimal for common network and system configurations. Do not change this setting without verifying that the
desired change will have a positive effect on network performance.
Default Adaptive
Range l Adaptive
l Extreme
l High
l Medium
l Low
l Minimal
l Off
Low Latency Interrupts
LLI enables the network device to bypass the configured interrupt moderation scheme based on the type of data being
received. It configures which arriving TCP packets trigger an immediate interrupt, enabling the system to handle the
packet more quickly. Reduced data latency enables some applications to gain faster access to network data.
NOTE: When LLI is enabled, system CPU utilization may increase.
LLI can be used for data packets containing a TCP PSH flag in the header or for specified TCP ports.
l Packets with TCP PSH Flag - Any incoming packet with the TCP PSH flag will trigger an immediate interrupt.
The PSH flag is set by the sending device.
l TCP Ports - Every packet received on the specified ports will trigger an immediate interrupt. Up to eight ports
may be specified.
Default Disabled
Range l Disabled
l PSH Flag-Based
l Port-Based
Receive Buffers
Defines the number of Receive Buffers, which are data segments. They are allocated in the host memory and used to
store the received packets. Each received packet requires at least one Receive Buffer, and each buffer uses 2KB of
memory.
You might choose to increase the number of Receive Buffers if you notice a significant decrease in the performance of
received traffic. If receive performance is not an issue, use the default setting appropriate to the adapter.
Default 512, for the 10 Gigabit Server Adapters.
256, for all other adapters depending on the features selected.
Range 128-4096, in intervals of 64, for the 10 Gigabit Server Adapters.
80-2048, in intervals of 8, for all other adapters.
Recommended Value Teamed adapter: 256
Using IPSec and/or multiple features: 352