Multi-level trigger architecture is commonly used in data acquisition systems for large scale high energy physics experiments.In multi-level architecture

data is sent to higher level systems through network

which is usually based on Ethernet technology.In order to improve system efficiency and find out optimization methods for data transmission

in this paper we describe the network data receiving process of Linux 2.4 kernel in terms of data flow that based on ARM platform

and combined with the data obtained from the kernel.Reasons of changing network performance are analyzed

too

and system optimization recommendations are given.