Re: [PATCH 0/3][RFC] virtio-blk: add io_uring passthrough support for virtio-blk

Stefan Hajnoczi
2024-12-17T21:00:50Z

On Tue, 17 Dec 2024 at 12:54, Jens Axboe <axboe@kernel.dk> wrote:
>
> On 12/16/24 11:08 PM, Jingbo Xu wrote:
> >> That's why I asked Jens to weigh in on whether there is a generic
> >> block layer solution here. If uring_cmd is faster then maybe a generic
> >> uring_cmd I/O interface can be defined without tying applications to
> >> device-specific commands. Or maybe the traditional io_uring code path
> >> can be optimized so that bypass is no longer attractive.
>
> It's not that the traditional io_uring code path is slower, it's in fact
> basically the same thing. It's that all the other jazz that happens
> below io_uring slows things down, which is why passthrough ends up being
> faster.

Are you happy with virtio_blk passthrough or do you want a different approach?

Stefan