Intel Ethernet X520 10GbE Dual Port KX4 Mezz User Manual page 47

LAN RSS Configuration
RSS is enabled on the Advanced tab of the adapter property sheet. If your adapter does not support RSS, or if the SNP
or SP2 is not installed, the RSS setting will not be displayed. If RSS is supported in your system environment, the fol-
lowing will be displayed:
Port NUMA Node. This is the NUMA node number of a device.
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Starting RSS CPU. This setting allows you to set the preferred starting RSS processor. Change this setting if
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the current processor is dedicated to other processes. The setting range is from 0 to the number of logical CPUs
- 1. In Server 2008 R2, RSS will only use CPUs in group 0 (CPUs 0 through 63).
Max number of RSS CPU. This setting allows you to set the maximum number of CPUs assigned to an adapter
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and is primarily used in a Hyper-V environment. By decreasing this setting in a Hyper-V environment, the total
number of interrupts is reduced which lowers CPU utilization. The default is 8 for Gigabit adapters and 16 for 10
Gigabit adapters.
Preferred NUMA Node. This setting allows you to choose the preferred NUMA (Non-Uniform Memory Access)
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node to be used for memory allocations made by the network adapter. In addition the system will attempt to use
the CPUs from the preferred NUMA node first for the purposes of RSS. On NUMA platforms, memory access
latency is dependent on the memory location. Allocation of memory from the closest node helps improve per-
formance. The Windows Task Manager shows the NUMA Node ID for each processor.
NOTE: This setting only affects NUMA systems. It will have no effect on non-NUMA systems.
Receive Side Scaling Queues. This setting configures the number of RSS queues, which determine the space
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to buffer transactions between the network adapter and CPU(s).
Default 2 queues for the Intel® 10 Gigabit Server Adapters
1 queue for the following adapters.
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LAN RSS and Teaming
If RSS is not enabled for all adapters in a team, RSS will be disabled for the team.
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If an adapter that does not support RSS is added to a team, RSS will be disabled for the team.
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If you create a multi-vendor team, you must manually verify that the RSS settings for all adapters in the team are
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the same.
FCoE RSS
If FCoE is installed, FCoE RSS is enabled and applies to FCoE receive processing that is shared across processor
cores.
Intel® Gigabit ET Dual Port Server Adapter
Intel® Gigabit ET Quad Port Server Adapter
Intel® Gigabit ET Quad Port Mezzanine Card
1 queue is used when low CPU utilization is required.
2 queues are used when good throughput and low CPU utilization are required.
4 queues are used for applications that demand maximum throughput and transactions
per second.
8 and 16 queues are supported on the Intel® 82598-based and 82599-based adapters.
NOTES:
The 8 and 16 queues are only available when PROSet for Windows Device
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Manager is installed. If PROSet is not installed, only 4 queues are available.
Using 8 or more queues will require the system to reboot.
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NOTE: Not all settings are available on all adapters.