Limited Host-Based Transmission

Feature Set N-ANL9

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Napatech SmartNIC
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Feature Description

In this chapter

This chapter describes the limited host-based transmission functionality, which enables DMA-based transmission of frames located in a host buffer in the server application memory.

Note: This chapter only applies to NT200A01-2×100 and to NT200A01-2×100/40 running at 2 × 100 Gbit/s.

Transmission performance

The limited TX functionality consumes a significant amount of CPU resources if large amounts of data are transmitted. The performance depends on the server system. Line rate cannot be obtained. For large frames a maximum throughput of 50 Gbit/s can be obtained. For 64-byte frames the throughput is around 40 Gbit/s.

Transmission API

The limited TX functionality is activated using the NT_NetTxOpen function (see DN-0449).

Note: It is not possible to configure timing between the transmitted packets, for instance to preserve the inter-frame gap.