Performance Tuning Guidelines for Windows Server 2008 R2 April 12, 2013 Abstract




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Choosing a Network Adapter


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

Offload Capabilities


Offloading tasks can reduce CPU usage on the server, which improves overall system performance. The Microsoft network stack can offload one or more tasks to a network adapter if you choose one that has the appropriate offload capabilities. Table 5 provides more details about each offload capability.

Table 5. Offload Capabilities for Network Adapters



Offload type

Description

Checksum calculation

The network stack can offload the calculation and validation of both Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) checksums on sends and receives. It can also offload the calculation and validation of both IPv4 and IPv6 checksums on sends and receives.

IP security authentication and encryption

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

Segmentation of large TCP packets

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

TCP stack

The TCP offload engine (TOE) enables a network adapter that has the appropriate capabilities to offload the entire network stack.


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Performance Tuning Guidelines for Windows Server 2008 R2 April 12, 2013 Abstract

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