Performance Tuning Guidelines for Windows Server 2012 April 12, 2013 Abstract




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Choosing a Network Adapter


Network-intensive applications require high-performance network adapters. This section explores some considerations for choosing network adapters.

Offload Capabilities


Offloading tasks can reduce CPU usage on the server, which improves the overall system performance. The network stack in Microsoft products can offload one or more tasks to a network adapter if you choose one that has the appropriate offload capabilities. Table 6 provides details about each offload capability.

Table 6. Offload Capabilities for Network Adapters



Offload type

Description

Checksum calculation

The network stack can offload the calculation and validation of Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) checksums on send and receive code paths. It can also offload the calculation and validation of IPv4 and IPv6 checksums on send and receive code paths.

IP security authentication and encryption

The TCP/IP transport layer can offload the calculation and validation of encrypted checksums for authentication headers and Encapsulating Security Payloads (ESPs). The TCP/IP transport layer can also offload the encryption and decryption of ESPs.

Segmentation of large TCP packets

The TCP/IP transport layer supports Large Send Offload v2 (LSOv2). With LSOv2, the TCP/IP transport layer can offload the segmentation of large TCP packets to the hardware.

Receive Segment Coalescing (RSC)

RSC is the ability to group packets together to minimize the header processing that is necessary for the host to perform. A maximum of 64 KB of received payload can be coalesced into a single larger packet for processing.

Receive-Side Scaling (RSS)

Receive-side scaling (RSS) is a network driver technology that enables the efficient distribution of network receive processing across multiple CPUs in multiprocessor systems.


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Performance Tuning Guidelines for Windows Server 2012 April 12, 2013 Abstract

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