From: Jens Axboe <[email protected]>
To: Jingbo Xu <[email protected]>,
Stefan Hajnoczi <[email protected]>,
Christoph Hellwig <[email protected]>
Cc: Ferry Meng <[email protected]>,
"Michael S . Tsirkin" <[email protected]>,
Jason Wang <[email protected]>,
[email protected], [email protected],
[email protected], [email protected],
Joseph Qi <[email protected]>
Subject: Re: [PATCH 0/3][RFC] virtio-blk: add io_uring passthrough support for virtio-blk
Date: Tue, 17 Dec 2024 10:54:26 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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
next prev parent reply other threads:[~2024-12-17 17:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-03 12:14 [PATCH 0/3][RFC] virtio-blk: add io_uring passthrough support for virtio-blk Ferry Meng
2024-12-03 12:14 ` [PATCH 1/3] virtio-blk: add virtio-blk chardev support Ferry Meng
2024-12-03 12:14 ` [PATCH 2/3] virtio-blk: add uring_cmd support for I/O passthru on chardev Ferry Meng
2024-12-04 15:19 ` kernel test robot
2024-12-03 12:14 ` [PATCH 3/3] virtio-blk: add uring_cmd iopoll support Ferry Meng
2024-12-04 21:47 ` [PATCH 0/3][RFC] virtio-blk: add io_uring passthrough support for virtio-blk Stefan Hajnoczi
2024-12-05 9:51 ` [Resend]Re: " Ferry Meng
2024-12-16 2:01 ` Ferry Meng
2024-12-16 7:38 ` Jason Wang
2024-12-16 12:07 ` Ferry Meng
2024-12-17 2:08 ` Jason Wang
2024-12-17 6:04 ` Ferry Meng
2024-12-16 15:54 ` Christoph Hellwig
2024-12-16 16:13 ` Stefan Hajnoczi
2024-12-17 2:12 ` Jason Wang
2024-12-17 6:08 ` Jingbo Xu
2024-12-17 17:54 ` Jens Axboe [this message]
2024-12-17 21:00 ` Stefan Hajnoczi
2024-12-17 21:07 ` Jens Axboe
2024-12-18 3:35 ` Ferry Meng
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