Re: [dm-devel] [PATCH V3 0/3] block/dm: support bio polling

[Ming Lei <ming.lei@redhat.com>]

On Tue, Mar 01, 2022 at 04:19:42PM -0500, Mike Snitzer wrote:
> On Mon, Feb 28 2022 at  7:58P -0500,
> Ming Lei <ming.lei@redhat.com> wrote:
> 
> > On Mon, Feb 28, 2022 at 11:27:44AM -0500, Mike Snitzer wrote:
> > > 
> > > Hey Ming,
> > > 
> > > I'd like us to follow-through with adding bio-based polling support.
> > > Kind of strange none of us that were sent this V3 ever responded,
> > > sorry about that!
> > > 
> > > Do you have interest in rebasing this patchset (against linux-dm.git's
> > > "dm-5.18" branch since there has been quite some churn)?  Or are you
> > > OK with me doing the rebase?
> > 
> > Hi Mike,
> > 
> > Actually I have one local v5.17 rebase:
> > 
> > https://github.com/ming1/linux/tree/my_v5.17-dm-io-poll
> > 
> > Also one for-5.18/block rebase which is done just now:
> > 
> > https://github.com/ming1/linux/tree/my_v5.18-dm-bio-poll
> > 
> > In my previous test on v5.17 rebase, the IOPS improvement is a bit small,
> > so I didn't post it out. Recently not get time to investigate
> > the performance further, so please feel free to work on it.
> 
> OK, I've rebased it on dm-5.18.
> 
> Can you please share the exact test(s) you were running?  I assume you
> were running directly against a request-based device and then
> comparing polling perf through dm-linear to the same underlying
> request-based device?

I run io_uring over dm-linear and dm-stripe, over two nvme disks with
2 poll_queues.

IOPS improvement can be observed, but not big.

Thanks,
Ming

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