[PATCH] nvme: remove cq check after submission

[Keith Busch]

On Thu, May 17, 2018 at 08:16:17AM -0600, Jens Axboe wrote:
> On 5/17/18 12:50 AM, Christoph Hellwig wrote:
> > On Wed, May 16, 2018 at 03:20:10PM -0600, Keith Busch wrote:
> >> On Wed, May 16, 2018 at 01:58:08PM -0600, Jens Axboe wrote:
> >>> We always check the completion queue after submitting, but in my testing
> >>> this isn't a win even on DRAM/xpoint devices. In some cases it's
> >>> actually worse. Kill it.
> >>
> >> Right, this was on my todo list. Agreed it's not helping anything.
> >> Applied to nvme-4.18.
> > 
> > While I agree in general didn't we have a case where this caused a
> > regression last time it came up?  Not that I'd complain if it goes
> > away..
> 
> Not that I'm aware of. I've been running with this patch for quite
> a while, while doing some work on polling.

Yah, I mentioned a few months back there appeared to be a problem with removing
this, but I was mistaken. I just didn't get back around to doing this.