Intel 10 Gigabit AT Ethernet Server Adapter, Руководство пользователя, Страница: 37 / 165

Interrupt Moderation Rate
Sets the Interrupt Throttle Rate (ITR). This setting moderates the rate at which Transmit and Receive
interrupts are generated.
When an event such as packet receiving occurs, the adapter generates an interrupt. The interrupt interrupts
the CPU and any application running at the time, and calls on the driver to handle the packet. At greater link
speeds, more interrupts are created, and CPU rates also increase. This results in poor system performance.
When you use a higher ITR setting, the interrupt rate is lower and the result is better CPU performance.
NOTE: A higher ITR rate also means that the driver has more latency in handling packets. If the
adapter is handling 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
IPv4 Checksum Offload
This allows the adapter to compute the IPv4 checksum of incoming and outgoing packets. This feature
enhances IPv4 receive and transmit performance and reduces CPU utilization.
With Offloading off, the operating system verifies the IPv4 checksum.
With Offloading on, the adapter completes the verification for the operating system.
Default RX & TX Enabled
Range
l
Disabled
l
RX Enabled
l
TX Enabled
l
RX & TX Enabled
Jumbo Frames
Enables or disables Jumbo Packet capability. The standard Ethernet frame size about 1514 bytes, while
Jumbo Packets are larger than this. Jumbo Packets can increase throughput and decrease CPU utilization.
However, additional latency may be introduced.