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

Jens Axboe
2024-12-17T21:07:28Z

On 12/17/24 2:00 PM, Stefan Hajnoczi wrote:
> 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?

I think it looks fine.

--
Jens Axboe