Abstract: To deal with the rapid increment of network traffic,an Intrusion Detection System (IDS) based on commodity multi-core platform was proposed. This paper evaluated some critical factors for the system performance, such as hardware,resource-assigning and network traffic features. Extensive experiments demonstrate that number of traffic flow and pps index have larger impact on system performance. I}he ids performance can be improved obviously by actieating the Hyper-Threading of multi-core processor and binding the detection engine with the CPU core. Our system is easy to be realized and has low priccperformancc ratio.

Key words: Intrusion detection, Multi-core, Hyper-threading