Research Article
A Measurement Study of the Linux TCP/IP Stack Performance and Scalability on SMP systems
@INPROCEEDINGS{10.1109/COMSWA.2006.1665153, author={Shourya P. Bhattacharya and Varsha Apte}, title={A Measurement Study of the Linux TCP/IP Stack Performance and Scalability on SMP systems}, proceedings={1st International ICST Conference on Communication System Software and MiddleWare}, publisher={IEEE}, proceedings_a={COMSWARE}, year={2006}, month={8}, keywords={}, doi={10.1109/COMSWA.2006.1665153} }- Shourya P. Bhattacharya
Varsha Apte
Year: 2006
A Measurement Study of the Linux TCP/IP Stack Performance and Scalability on SMP systems
COMSWARE
IEEE
DOI: 10.1109/COMSWA.2006.1665153
Abstract
The performance of the protocol stack implementation of an operating system can greatly impact the performance of networked applications that run on it. In this paper, we present a thorough measurement study and comparison of the network stack performance of the two popular Linux kernels: 2.4 and 2.6, with a special focus on their performance on SMP architectures. Our findings reveal that interrupt processing costs, device driver overheads, checksumming and buffer copying are dominant overheads of protocol processing. We find that although raw CPU costs are not very different between the two kernels, Linux 2.6 shows vastly improved scalability, attributed to better scheduling and kernel locking mechanisms. We also uncover an anomalous behavior in which Linux 2.6 performance degrades when packet processing for a single connection is distributed over multiple processors. This, however, verifies the superiority of the "processor per connection" model for parallel processing
