Design and implementation experiments of scalable socket buffer tuning

Although many research efforts have been devoted to the network congestion against an increase of the Internet traffic, only a few discussions are recently made on the performance improvement of the endhosts. In this paper, we propose a new architecture, which is called Scalable Socket Buffer Tuning (SSBT), to provide high performance and fair service for many TCP connections at the Internet endhosts. SSBT has two major features. The one is the Equation-based Automatic TCP Buffer Tuning (E-ATBT), where the sender host estimates ‘expected ’ throughput of the TCP connections through a simple mathematical equation, and assigns the send socket buffer to them according to the estimated throughput. The other is to reduce the number of memory accesses at the sender host by using some of new system calls, which is called Simple Memory-copy Reduction (SMR) scheme. We confirm an effectiveness of our proposed algorithm through the implementation experiments, and we have found that our SSBT can achieve up to 30 % gain of the Web server throughput, and the fair and effective usage of the sender socket buffer can be achieved.