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IIT CS 550 - Techniques for Implementing Quality of Service

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Table of ContentsAbstract:1.0 Introduction1.1 Eclipse Operating System1.2 Nemesis Operating System1.3 Real-Time Mach Operating System2.0 Implementation of QoS in Operating Systems2.1 Eclipse2.1.1 ReservationsThe developers of the Eclipse operating system design and implemented the /reserv (reservation) file system which the operating system can access, use and reconfigure the system resource schedulers. The directory nodes correspond to the nodes in the scheduler’s hierarchy and thus represent reservations. The file system allows the addition and deletion of reservations and the changing of schedule weights throughout. Each resource contains a reservation directory, for example, the CPU is represented by /reserv/CPU. If a resource has more than one reservation, it is split into /reserv/CPU/r1, /reserv/CPU/r2, etc.2.1.2 Tagging2.1.3 Reservation Domains2.1.4 Quality of Service Parameters2.1.5 Move-to-Rear List Scheduling (MTR-LS)2.2 Nemesis2.2.1 Quality of Service Manager2.2.2 Run Time Resource Allocation2.2.3 Accounting2.2.4 Policing2.3 Real-Time Mach2.3.1 Processor Reserves2.3.2 Dynamic QoS Server2.3.3 Q-RAM (QoS-based Resource Allocation Model)3.0 Conclusions and Summary4.0 Other Implementations of Quality of Service5.0 ReferencesTechniques for Implementing Quality of ServiceIn the Eclipse, Nemesis and Real-Time MachOperating Systems Francesca RuffoloDecember 6, 2001Instructor: Dr. Marius SoneruCS 550Comparative Operating SystemsTable of ContentsAbstract:........................................................................................................................................ 31.0 Introduction....................................................................................................................... 31.1 Eclipse Operating System............................................................................................................31.2 Nemesis Operating System.........................................................................................................31.3 Real-Time Mach Operating System............................................................................................42.0 Implementation of QoS in Operating Systems..................................................................42.1 Eclipse.............................................................................................................................................42.1.1 Reservations............................................................................................................. 52.1.2 Tagging......................................................................................................................52.1.3 Reservation Domains................................................................................................52.1.4 Quality of Service Parameters...................................................................................62.1.5 Move-to-Rear List Scheduling (MTR-LS)...................................................................72.2 Nemesis...........................................................................................................................................72.2.1 Quality of Service Manager.......................................................................................72.2.2 Run Time Resource Allocation..................................................................................82.2.3 Accounting................................................................................................................. 82.2.4 Policing...................................................................................................................... 92.3 Real-Time Mach.............................................................................................................................92.3.1 Processor Reserves...............................................................................................92.3.2 Dynamic QoS Server.............................................................................................92.3.3 Q-RAM (QoS-based Resource Allocation Model)....................................................103.0 Conclusions and Summary.............................................................................................124.0 Other Implementations of Quality of Service..................................................................125.0 References..................................................................................................................... 132Abstract:The requirement to make quality of service (QoS) guarantees available is increasing with theneed to run multiple server applications, such as audio and video media servers, web servers,and host services for multiple entities (organizations, individuals) on the same platform. Thispaper evaluates and compares the techniques used to implement quality of service in threeseparate operating systems: Eclipse/BSD, Nemesis, and Real-Time Mach. 1.0 IntroductionIn order to support multiple real-time applications on a single platform, the operating system musthave the ability to reserve system resources among several applications in order to achieve acertain level of performance. Although networks now provide quality of service guarantees withrespect to packet delay and bandwidth, these are of little value if they are not extended directly tothe application via the operating system. The motivation for implementing quality of service (QoS) control in operating systems is to allowexplicit control over provisioning of system resources among applications to achieve desiredlevels of predictable performance. In addition, quality of service is used to guarantee a certainlevel of performance to server applications.The quality of service initiatives requires the changing of current operating systems in the arearesource schedulers: CPU, disk (file systems), physical memory, and I/O.1.1 Eclipse Operating SystemEclipse is a product of research that evolved from the Plan 9 operating system that wasdeveloped by Bell Laboratories in New Jersey starting in the late 1980’s. Plan 9 was developedin response to several trends in the computing industry at that time.- Networks of smaller, more personal machines were preferred over large centralized time-shared computers (typically UNIX workstations)- Administrators grew weary of overloaded, routine time-sharing systems and wished tomove


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