On Tue, Mar 31, 2020 at 11:51:39AM -0400, Tejun Heo wrote:

Hello,

On Tue, Mar 31, 2020 at 11:47:41PM +0800, Weiping Zhang wrote:

quoted

Do you means drop the "io.wrr" or "blkio.wrr" in cgroup, and use a
dedicated interface
like /dev/xxx or /proc/xxx?

Yes, something along that line. Given that it's nvme specific, it'd be best if
the interface reflects that too - e.g. through a file under
/sys/block/nvme*/device/. Jens, Christoph, what do you guys think?

I'm pretty sure I voiced my opinion before - I think the NVMe WRR
queueing concept is completely broken and I do not thing we should
support it at all.