BFQ Still Trying To Replace The CFQ I/O Scheduler In Linux
Written by Michael Larabel in Linux Kernel on 27 July 2016 at 01:44 PM EDT. 24 Comments
LINUX KERNEL --
For a number of months there's been an effort to replace the CFQ I/O scheduler with BFQ inside the Linux kernel. That isn't happening for the current Linux 4.8 cycle, but new patches were published today in pursuing this goal.

Paolo Valente today published the 8th version of these patches to replace the CFQ I/O scheduler with BFQ. For those that don't recall from earlier Phoronix news about this mission, "This patchset replaces CFQ with the last version of BFQ (which is a proportional-share I/O scheduler). To make a smooth transition, this patchset first brings CFQ back to its state at the time when BFQ was forked from CFQ. Basically, this reduces CFQ to its engine, by removing every heuristic and improvement that has nothing to do with any heuristic or improvement in BFQ, and every heuristic and improvement whose goal is achieved in a different way in BFQ. Then, the second part of the patchset starts by replacing CFQ's engine with BFQ's engine, and goes on by adding current BFQ improvements and extra heuristics."

BFQ aims for low-latency with interactive applications, low-latency for soft real-time applications, high throughput, strong fairness guarantees, and other advantages over the current incarnation of CFQ.

More details via the v8 patch series.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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