Re: [PATCH 1/3] nvme/pci: Start request after doorbell ring

Keith Busch
2018-01-03T20:21:05Z

On Thu, Dec 21, 2017 at 02:01:44PM -0700, Jens Axboe wrote:
> I haven't either, but curious if others had. It's mostly just extra
> overhead, I haven't seen it provide a latency reduction of any kind.

I've removed the submission side poll in a local build, and amazingly I
am observing a not insignificant increase in latency without it on some
workloads with certain hardware. I will have to delay recommending/posting
removal of this pending further investigation.