When Receive Side Scaling (RSS) is enabled, all of the receive data processing for a particular TCP connection is shared across multiple processors or processor cores. Without RSS all of the processing is performed by a single processor, resulting in less efficient system cache utilization.
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RSS is enabled on the Advanced tab of the adapter property sheet. If your adapter does not support RSS, or if your operating system does not support it, the RSS setting will not be displayed.
This setting allocates queue space to buffer transactions between the network adapter and CPU(s).
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This setting allows you to set the preferred starting RSS processor. Change this setting if 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).
This setting allows you to choose the preferred NUMA (Non-Uniform Memory Access) 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 performance. 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. |