Start-time fair queueing: a scheduling algorithm for integrated services packet switching networks
IEEE/ACM Transactions on Networking (TON)
Resource containers: a new facility for resource management in server systems
OSDI '99 Proceedings of the third symposium on Operating systems design and implementation
Dynamic power management based on continuous-time Markov decision processes
Proceedings of the 36th annual ACM/IEEE Design Automation Conference
Improving dynamic voltage scaling algorithms with PACE
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SOSP '01 Proceedings of the eighteenth ACM symposium on Operating systems principles
A Framework for Evaluating Storage System Security
FAST '02 Proceedings of the Conference on File and Storage Technologies
Dynamic Control of a Queue with Adjustable Service Rate
Operations Research
Dynamic selection and effective compression of key frames for video abstraction
Pattern Recognition Letters
Toward a Taxonomy and Costing Method for Security Services
ACSAC '99 Proceedings of the 15th Annual Computer Security Applications Conference
Reducing Delay with Dynamic Selection of Compression Formats
HPDC '01 Proceedings of the 10th IEEE International Symposium on High Performance Distributed Computing
Power-aware QoS Management in Web Servers
RTSS '03 Proceedings of the 24th IEEE International Real-Time Systems Symposium
Service Selection Algorithms for Web Services with End-to-End QoS Constraints
CEC '04 Proceedings of the IEEE International Conference on E-Commerce Technology
Design, implementation and evaluation of security in iSCSI-based network storage systems
Proceedings of the second ACM workshop on Storage security and survivability
Data compression algorithms for energy-constrained devices in delay tolerant networks
Proceedings of the 4th international conference on Embedded networked sensor systems
Policies for dynamic clock scheduling
OSDI'00 Proceedings of the 4th conference on Symposium on Operating System Design & Implementation - Volume 4
Energy conservation policies for web servers
USITS'03 Proceedings of the 4th conference on USENIX Symposium on Internet Technologies and Systems - Volume 4
The eclipse operating system: providing quality of service via reservation domains
ATEC '98 Proceedings of the annual conference on USENIX Annual Technical Conference
Web server support for tiered services
IEEE Network: The Magazine of Global Internetworking
Statistical profiling-based techniques for effective power provisioning in data centers
Proceedings of the 4th ACM European conference on Computer systems
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A feature exhibited by many modern computing systems is their ability to improve the quality of output they generate for a given input by spending more computing resources on processing it. Often this improvement comes at the price of degraded performance in the form of reduced throughput or increased response time. We formulate QDSL, a class of constrained optimization problems defined in the context of a queueing server equipped with multiple levels of service. Solutions to QDSL provide rules for dynamically varying the service level to achieve desired trade-offs between output quality and performance. Our approach involves reducing restricted versions of such systems to Markov Decision Processes. We find two variants of such systems worth studying: (i) VarSL, in which a single request may be serviced using a combination of multiple levels during its lifetime and (ii) FixSL in which the service level may not change during the lifetime of a request. Our modeling indicates that optimal service level selection policies in these systems correspond to very simple rules that can be implemented very efficiently in realistic, online systems. We find our policies to be useful in two response-time-sensitive real-world systems: (i) qSecStore, an iSCSI-based secure storage system that has access to multiple encryption functions, and (ii) qPowServer, a server with DVFS-capable processor. As a representative result, in an instance of qSecStore serving disk requests derived from the well-regarded TPC-H traces, we are able to improve the fraction of requests using more reliable encryption functions by 40-60%, while meeting performance targets. In a simulation of qPowServer employing realistic DVFS parameters, we are able to improve response times significantly while only violating specified server-wide power budgets by less than 5W.