Critical path analysis of TCP transactions

摘要: Improving the performance of data transfers in Internet (such as Web transfers) requires a detailed understanding when and how delays are introduced. Unfortunately, complexity like those using HTTP is great enough that identifying precise causes difficult. In this paper we describe method for pinpointing where introduced into applications by critical path analysis. By constructing profiling path, it possible to determine what fraction total transfer latency due packet propagation, network variation (e.g., queuing at routers or route fluctuation), losses, server client. We have implemented our technique tool called tcpeval automates analysis transactions. show robust analyze traces taken two different TCP implementations (Linux FreeBSD). To demonstrate utility approach, present results set transactions over 14 days under variety conditions. The can shed considerable light on transfers, expose subtleties behavior entire end-to-end system.