Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig laden im Rahmen des Informatik-Kolloquiums zu folgendem Vortrag ein:

Pål Halvorsen, Associate Professor at Simula Research Laboratory, and at the Department of Informatics, University of Oslo; Vice research director, network and distributed systems at Simula: Assessment of Linux' Data Path Implementations for Download and Streaming

Beginn: 12.03.2007, 17:00 Uhr Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 1. OG, Seminarraum 105 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2007-03-12-halvorsen.html Kontakt: Prof. Dr.-Ing. Lars Wolf

On servers or proxy caches, there is a huge scaling challenge in supporting thousands of concurrent users that request delivery of high-rate, time-dependent data like audio and video, because this requires transfers of large amounts of data through several sub-systems within a streaming node. For example, data copying and user/kernel boundary crossings consume a large amount of resources and may be severe bottlenecks. Here, we therefore revisit the "old" data movement problem and provide an evaluation of possible streaming data I/O paths in Linux 2.6 kernel. We have implemented and evaluated several enhanced mechanisms and show how to provide support for more efficient memory usage and reduction of user/kernel space switches for streaming applications.