In the fields of packet-switched networks and computer networking, the traffic engineering term Quality of Service (QoS) refers to the probability of the telecommunication network meeting a given traffic contract, or in many cases is used informally to refer to the probability of a packet succeeding in passing between two points in the network within its desired latency period.
In the field of telephony, telephony quality of service refers to lack of noise and tones on the circuit, appropriate loudness levels etc., and includes grade of service.
Realtime :: Operating Systems
Research :: Operating Systems

DROPS: Dresden Real-Time Operating System Project - Several RTOSs with QoS focus: much research is done on networking support for continuous-media applications, very few projects tackle related OS issues, such as scheduling and file system support for bounded response time: overview, status, download, installation, use, documentation, papers.
Meta Description: [ DROPS: overview, status, download, installation, use, documentation, papers ]
Getting Closer to 99.9999% Network Uptime - Has information loss become so crucial? Is there real demand for highly available networks? Or are network OEMs, fighting a bad economy, making high-tech versions of detergent ads claiming new and improved. [Vaughan-Nichols Associates]
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Operating Systems with Quality of Service Guarantees - Short, annotated, alphabetically sorted list and links, part of larger system.
Project Satori - High-Performance distributed object environment emphasizing adaptive end-to-end QoS guarantees. Abstract, components, documents, people, funding.
Roadrunner - One-user, general purpose OS built on a protected memory, POSIX threads RT kernel; full kernel, device drivers, file systems, and network protocols runs in about 200 K RAM; now runs on x86 CPUs but designed for easy portability. [Open source, GPL]
Meta Description: [ Cornfed Systems, LLC, home of Cornfed SIP VOIP, the SIP Softphone for Linux and Embedded Systems. ]
Scout - Free for non-commercial use. Communication-oriented OS focused on network systems: network-attached devices, set-top boxes, and hand-held devices. Fast, customizable, based on new ways to structure and construct OSs: The Path: how data flows between end-points in a system; paths are primary objects to which resources are assigned. Also exploring new compiler technologies for system design and implementation, based on this insight: extensible OSs are worthless if no one can build or extend them.
SUMO - SUpport for Multimedia in Operating systems, Lancaster University: microkernel OS with facilities to support distributed realtime and multimedia applications and ODP-based multimedia distributed application platforms.
Tornado - Object-oriented operating system for large-scale shared-memory multiprocessors. Minimizes data sharing via careful design: often eliminates data sharing even when sharing appears natural. Successor to Hurricane.
VINO - Extensible OS, high reusability and modularity, application-directed kernel policy, universal resource interface, take no usual solutions for granted (question everything): software and postscript downloads.
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