Budget Fair Queuing IO Scheduler
Linux news"We are working [on] a new I/O scheduler based on CFQ, aiming at improved predictability and fairness of the service, while maintaining the high throughput it already provides," began Fabio Checconi, announcing the BFQ I/O scheduler. "The Budget Fair Queueing (BFQ) scheduler turns the CFQ Round-Robin scheduling policy of time slices into a fair queuing scheduling of sector budgets," he continued, "more precisely, each task is assigned a budget measured in number of sectors instead of amount of time, and budgets are scheduled using a slightly modified version of WF2Q+. The budget assigned to each task varies over time as a function of its behaviour. However, one can set the maximum value of the budget that BFQ can assign to any task." Fabio went on to explain:
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