On 5/25/18 3:14 PM, Jeff Moyer wrote: > Bryan Gurney reported I/O errors when using dm-zoned with a host-managed > SMR device. It turns out he was using CFQ, which is the default. > Unfortunately, as of v4.16, only the deadline schedulers work well with > host-managed SMR devices. This series aatempts to switch the elevator > to deadline for those devices. > > NOTE: I'm not super happy with setting up one iosched and then > immediately tearing it down. I'm open to suggestions on better ways > to accomplish this goal. Let's please not do this, a few years ago I finally managed to kill drivers changing the scheduler manually. Why can't this go into a udev (or similar) rule? That's where it belongs, imho. -- Jens Axboe
