Re: [PATCH] virtio_blk: set the default scheduler to none

Michael S. Tsirkin
2023-12-27T10:06:21Z

On Wed, Dec 27, 2023 at 03:26:30PM +0800, Li Feng wrote:
>
>
> > On Dec 26, 2023, at 23:38, Michael S. Tsirkin <mst@redhat.com> wrote:
> >
> > On Tue, Dec 26, 2023 at 05:01:40PM +0800, Li Feng wrote:
> >> I don't have ideas right now to answer Christoph/Paolo's question.
> >
> > Paolo did some testing on this thread and posted some concerns.
> > Do you disagree with his analysis?
>
> Paolo gave a very detailed data analysis. Indeed, in some low queue depth
> scenarios, the data dropped somewhat. However, I suspect that it may be
> caused by other problems (such as test fluctuations) rather than the benefits
> brought by deadline.

Maybe. I think it would be up to you to prove this then.

> BTW, I think 128 queue depth test is a very important and common performance
> test item for storage devices.
>
> Thanks,
> Li
>
> >
> > --
> > MST
> >