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Multimedia Tools and Applications, 24, 528, 2004 c 2004 Kluwer Academic Publishers. Manufactured in The Netherlands.

Summary: Multimedia Tools and Applications, 24, 5­28, 2004
c 2004 Kluwer Academic Publishers. Manufactured in The Netherlands.
Packet Video Broadcasting with General-Purpose
Operating Systems in an Ethernet
EDUARDO MAGA ~NA emagana@eecs.berkeley.edu
Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA
JAVIER ARACIL javier.aracil@unavarra.es
JES ´US VILLADANGOS jesusv@unavarra.es
Departamento de Autom´atica y Computaci´on, Universidad P´ublica de Navarra, Pamplona, Spain
Abstract. Video transmission with general-purpose PCs poses a number of requirements that radically differ
from those of high-end dedicated video servers. We analyze the scenario of an Ethernet local area network in which
a number of PCs are transmitting video streams, while other TCP/IP applications are also running concurrently.
Our findings show that since the operating system clock resolution cannot cope with the transmission timing
requirements the following holds: if the video transmission is performed with exact timing accuracy to maintain
a constant rate then CPU load grows to 100%, thus blocking the PC for other user applications; on the other
hand, if transmission is performed in a bursty manner, i.e. with sleep system calls, then CPU load decreases
dramatically but the increased burstiness of the video stream has a negative impact on network performance (for
example, capture effect in the Ethernet). Furthermore, the impact of video transmission over the rest of TCP/IP
applications running on the same network depends heavily on the packet size. We provide an integrated analysis
of operating system and network parameters to achieve video broadcasting while preserving timing requirements


Source: Rico, Javier Aracil - Departamento de Ingeniería Informática, Universidad Autonoma de Madrid


Collections: Computer Technologies and Information Sciences