The popularity of the Internet and the web is making real-time communication achieve a new significance. Time-critical applications such as Internet phone, video teleconferencing, and streaming audio /video are becoming increasingly common. Network bandwidth delivered to these applications is limited by host protocol processing overheads, especially the receive-side overhead (since it usually exceeds transmission overhead). We present an architecture for reducing receive-side overhead for processing realtime messages. In our scheme, all protocol processing is performed by the application threads themselves. Moreover, message data needs to be copied only once (without any hardware support from the network adapter or any restrictions on the network API). We implement UDP/IP to evaluate our architecture. Measurements show that non-data-touching overheads are reduced 13 % which benefits short messages such as live audio. Data-touching overheads are reduced 20--30% which benefits long messages such as video and streaming data.
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