Bruce A. Mah

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Bruce A. Mah bmah@CS.Berkeley.EDU The Tenet Group Computer Science Division University of California at Berkeley Berkeley, CA 94720-1776 The workload of the global Internet is dominated by the Hypertext Transfer Protocol (HTTP), an application protocol used by World Wide Web clients and servers. Simulation studies of IP networks will require a model of the(More)
Mobile computers using wireless networks, along with multimedia applications, are two emerging trends in computer systems. This new mobile multimedia computing environment presents many challenges, due to the requirements of multimedia applications and the mobile nature of hosts. We present several alternative schemes for maintaining network connections(More)
The Real-time Channel Administration Protocol (RCAP) provides control and administration services for the Tenet real-time protocol suite, a connection-oriented suite of network and transport layer protocols for realtime communication. RCAP performs per-channel reservation of network resources based on worst-case analysis to provide hard guarantees on delay,(More)
Many future applications will require guarantees on network performance, such as bounds on throughput, delay, delay jitter, and reliability. To address this need, we have designed, simulated, and implemented a suite of network protocols to support real-time channels (network connections with mathematically provable performance guarantees). The protocols,(More)
Future applications will require network services that offer performance guarantees. We refer to such services as “real-time”, and to network connections offering such guarantees as “real-time channels”. In this report, we discuss the service description and interfaces for a mechanism for the administration of real-time channels. We also describe the(More)
Tools such as pathchar, clink, and pchar attempt to measure the capacity of every Layer-3 (L3) hop in a network path. These tools use the same underlying measurement methodology, which we refer to as Variable Packet Size (VPS) probing. The key assumption in VPS is that each L3 hop along a path increases the delay of a packet by a “serialization latency”,(More)
Mobile computers using wireless networks, along with multimedia applications, are two emerging trends in computer systems. This new mobile multimedia computing environment presents many challenges, due to the requirements of multimedia applications and the mobile nature of hosts. We present several alternative schemes for maintaining network connections(More)
In this report, we present measurements of IP multicast traffic taken at the University of California at Berkeley. We note that the volume and distribution of IP multicast traffic is highly variable, and can depend on a small number of active conversations. From examining many-way multimedia conferences, we note the need for some kind of conference control,(More)
Starting from Jacobson's pathchar [1], there has been a significant interest in techniques that can measure the link capacities, a.k.a, link rates, of an IP path. Follow-up research papers and variations ofpathchar are Downey's clink [2], Mah's pchar [3], and Lai's tailgating technique in nettimer [4]. The motivation for such per-hop capacity estimation(More)