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

Jens Axboe
2024-12-17T17:54:28Z

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.

--
Jens Axboe