On Thu, 2018-10-04 at 20:25 +-0100, Alan Cox wrote: +AD4 +AD4 I agree with Jens that it's best to leave it to the Linux distributors to +AD4 +AD4 select a default I/O scheduler. +AD4 +AD4 That assumes such a thing exists. The kernel knows what devices it is +AD4 dealing with. The kernel 'default' ought to be 'whatever is usually best +AD4 for this device'. A distro cannot just pick a correct single default +AD4 because NVME and USB sticks are both normal and rather different in needs. Which I/O scheduler works best also depends which workload the user will run. BFQ has significant advantages for interactive workloads like video replay with concurrent background I/O but probably slows down kernel builds. That's why I'm not sure whether the kernel should select the default I/O scheduler. Bart.
