Re: [PATCH] block: BFQ default for single queue devices

[Christoph Hellwig]

On Wed, Oct 03, 2018 at 07:42:15AM +0000, Damien Le Moal wrote:
> Of note also is that host-managed like sequential zone devices are also likely
> to show up soon with the work being done in the NVMe standard on the new "Zoned
> namespace" feature proposal. These devices will also require a scheduler like
> mq-deadline guaranteeing per-zone in-order delivery of sequential write
> requests. Looking only at the number of queues of the device is not enough to
> choose the best (most reasonnable/appropriate) scheduler.

We actually have a plan to avoid the need for a non-reordering scheduler
there (including a Linux prototype for it).  Lets see if it survives the
committee.