We are not able to resolve this OAI Identifier to the repository landing page. If you are the repository manager for this record, please head to the Dashboard and adjust the settings.
This paper presents our real-time disk scheduler called the DeltaL scheduler, which optimizes unscheduled best-effort disk requests by giving priority to best-effort disk requests while meeting real-time request deadlines. Our scheduler tries to execute real-time disk requests as much as possible in the background. Only when real-time request deadlines are endangered, our scheduler gives priority to real-time disk requests. The DeltaL disk scheduler is part of our mixed-media file system called Clockwise. An essential part of our work are extensive and detailed raw disk performance measurements. These raw performance measurements are used by the DeltaL disk scheduler for its real-time schedulability analysis and to decide whether scheduling a best-effort request before a real-time request violates real-time constraints. Further, the raw performance measurements are used by a Clockwise off-line simulator where a number of different disk schedulers are compared. We compare the DeltaL scheduler with a prioritizing emph{Latest Start Time (textsc{lst) scheduler and non-prioritizing textsc{edf scheduler. The DeltaL scheduler is comparable to textsc{lst in achieving low latencies for best-effort requests under light to moderate real-time loads and better in achieving low latencies for best-effort requests for extreme real-time loads. The simulator is calibrated to an actual Clockwise. Clockwise runs on a 200,textsc{mhz Pentium-Pro based textsc{pc with textsc{pci bus, multiple textsc{scsi controllers and disks on Linux 2.2.x and the Nemesis kernel. Clockwise\'s performance is dictated by the hardware: all available bandwidth can be committed to real-time streams, provided hardware overloads do not occur
Is data on this page outdated, violates copyrights or anything else? Report the problem now and we will take corresponding actions after reviewing your request.