BFQ I/O Scheduler Patches Revised, Aiming To Be Extra Scheduler In The Kernel
Written by Michael Larabel in Linux Storage on 27 October 2016 at 01:12 PM EDT. 13 Comments
LINUX STORAGE --
BFQ developers had hoped to replace CFQ in the mainline Linux kernel with Budget Fair Queueing for a variety of reasons but it hadn't ended up making it mainline. Now the developers are hoping to introduce BFQ back to mainline as an extra available scheduler.

Paolo Valente on Wednesday published the latest patches dubbed "BFQ-v0" for adding it as an extra scheduler. He began by saying, "this new patch series turns back to the initial approach, i.e., it adds BFQ as an extra scheduler, instead of replacing CFQ with BFQ. This patch series also contains all the improvements and bug fixes recommended by Tejun, plus new features of BFQ-v8r5...On average CPUs, the current version of BFQ can handle devices performing at most ~30K IOPS; at most ~50 KIOPS on faster CPUs. These are about the same limits as CFQ. There may be room for noticeable improvements regarding these limits, but, given the overall limitations of blk itself, I thought it was not the case to further delay this new submission."

Budget Fair Queueing (BFQ) aims to provide low-latency for interactive applications and soft real-time applications, higher speed for code development tasks, high throughput, strong fairness and bandwidth/delay guarantees, and more. More details on BFQ and the early benchmarks can be found via this mailing list announcement.
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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 20,000 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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