• Offload Capabilities
  • Performance Tuning Guidelines for Windows Server 2003




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    Choosing a Network Adapter


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

    WHQL Certification


    Choose a network adapter with Microsoft Windows Hardware Quality Labs (WHQL) certification.

    Offload Capabilities


    Offloading tasks can help lower CPU usage on the server, improving overall system performance. The Microsoft TCP/IP transport can offload one or more of the following tasks to a network adapter that has the appropriate task-offload capabilities:

    • Checksum tasks. The TCP/IP transport can offload the calculation and validation of IP and TCP checksums for sends and receives.

    • IP security tasks. The TCP/IP transport can offload the calculation and validation of encrypted checksums for authentication headers (AH) and encapsulating security payloads (ESP). The TCP/IP transport can also offload the encryption and decryption of ESP payloads.

    • Segmentation of large TCP packets. The TCP/IP transport supports large send offload (LSO). With LSO, the TCP/IP transport can offload the segmentation of large TCP packets.

    • Stack offload. The entire network stack can be offloaded to a network adapter that has the appropriate capabilities.


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    Performance Tuning Guidelines for Windows Server 2003

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