Mirror for the BFQ I/O disk scheduler for Linux

Welcome to yet another mirror site for the BFQ (Budget Fair Queueing) I/O disk scheduler for Linux. Here you can get all the BFQ patches for the supported Linux kernel versions and follow the instructions below on how to patch the Linux kernel with these patches in order to be able to use the BFQ I/O scheduler.

Getting BFQ and patching the Linux kernel


NOTE: As of Linux kernel version 4.12, BFQ has been accepted into the mainline kernel. However, it is only available for blk-mq (Multi-Queue Block) so you will have to pass the kernel boot option scsi_mod.use_blk_mq=1 and manually select BFQ by issuing the following for each of your devices:

echo bfq > /sys/block/sdX/queue/scheduler (replace X appropriately)

Or you can create the file 60-block.rules in /etc/udev/rules.d with the below in it and it will set BFQ as default during boot.

ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/scheduler}="bfq"

BFQ as a kernel module


BFQ can also be compiled as a Linux kernel module. If this is the case or if you installed it from your distro repo as a module, you need to do a few things in order to set it as the default disk scheduler. In the below example, you'll find instructions for openSUSE systems. If you use another distro, the below may differ so please Google a bit to find the appropriate steps. The below assumes you use openSUSE version 13.2 or higher and have built BFQ as a module or installed the BFQ KMP package for openSUSE from here.

BFQ in action


Paolo Valente, one of the main BFQ developers, has posted some videos comparing BFQ against the other Linux disk schedulers. Check them out!