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Quality of Service Manager for Linux
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Description
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Keywords:
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Real-Time, QoS, Resource Reservation management, Linux
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Description:
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The use of computer based solutions for time-sensitive applications is increasingly popular. Important examples include multimedia streaming, video-conference, CD/DVD burning and so forth. Such applications are certainly time-sensitive but classical hard real-time techniques prove unsuitable to support them. Soft real-time scheduling solutions are commonly regarded as a better solution since they provide temporal isolation, thus allowing for individual task timing guarantees. Moreover, they approximate a fluid allocation of resources, which is certainly a desirable feature to have, for instance, in multimedia applications. However, the problem of finding a correct allocation of bandwidth to the different tasks is still to be considered as a tough problem. This problem is addressed in this software components and it essentially amounts to finding an appropriate allocation of resources to competing activities. To this regard, a static policy, in our evaluation, confronts unfavorably to a dynamic one. The main argument to support this point of view is that there is often a structure in the dynamic variations of resource requirements for tasks. For instance a typical movie alternates ''fast scenes'' (which induce a heavy computation workload) to ''slow'' dialogues between the characters (which on the contrary require a light computation). To take advantage of this structure, we propose a dynamic adjustment of the bandwidth, in which a software module complementary to the scheduler collects QoS measures for the executing tasks and varies the assigned bandwidth accordingly.
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General information
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Author(s):
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Luca Marzario
(SSSA)
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Participants:
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Scuola Superiore S. Anna
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Workpackage:
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Development of resource management components
(WP4)
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Deliverable:
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Component documentation can be found in deliverable
D4.2_rep
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Component homepage:
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http://www.ocera.org
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Licenses:
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GPL
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Current version:
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1.0-1
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Status:
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Alpha
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Hardware:
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Platform:
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Dependencies:
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Linux(2.4.18), Linux/CBS Scheduler(1.0), Generic Scheduler patch(1.0) and Preemption Compatibility patch(1.0)
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Download
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Current version:
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1.0-1
[qmgr-1.0-1.tgz]
[src]
[CVS at SourceForge]
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Note:
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This component cannot be used directly. It has to be used within OCERA
framework. Sources are provided only for documentation and portability
purposes.
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Status codes:
Analysis
>>
Design
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Alpha
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Beta
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Testing
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Stable
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