On Tue, 17 Dec 2024 at 12:54, Jens Axboe <axboe@xxxxxxxxx> 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
