Limited Host-Based Transmission

Napatech Link-Capture™ Software Features

Intel® PAC
Napatech SmartNIC
Content Type
Feature Description
Capture Software Version
Link™ Capture Software 12.11

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 the following SmartNICs.
  • NT40A11 running on the 4 × 10/1 Gbit/s capture image
  • NT40E3-4-PTP running on the capture image

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 64-byte frames the throughput is around 40 Mbit/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.