From: Ming Lei <ming.lei@redhat.com>
To: linux-block@vger.kernel.org, virtualization@lists.linux.dev,
linux-nvme@lists.infradead.org
Cc: ming.lei@redhat.com
Subject: [Report] requests are submitted to hardware in reverse order from nvme/virtio-blk queue_rqs()
Date: Wed, 24 Jan 2024 19:59:54 +0800 [thread overview]
Message-ID: <ZbD7ups50ryrlJ/G@fedora> (raw)
Hello,
Requests are added to plug list in reverse order, and both virtio-blk
and nvme retrieves request from plug list in order, so finally requests
are submitted to hardware in reverse order via nvme_queue_rqs() or
virtio_queue_rqs, see:
io_uring submit_bio vdb 6302096 4096
io_uring submit_bio vdb 12235072 4096
io_uring submit_bio vdb 7682280 4096
io_uring submit_bio vdb 11912464 4096
io_uring virtio_queue_rqs vdb 11912464 4096
io_uring virtio_queue_rqs vdb 7682280 4096
io_uring virtio_queue_rqs vdb 12235072 4096
io_uring virtio_queue_rqs vdb 6302096 4096
May this reorder be one problem for virtio-blk and nvme-pci?
Thanks,
Ming
next reply other threads:[~2024-01-24 12:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-24 11:59 Ming Lei [this message]
2024-01-24 15:41 ` [Report] requests are submitted to hardware in reverse order from nvme/virtio-blk queue_rqs() Keith Busch
2024-01-24 22:32 ` Damien Le Moal
2024-01-25 4:23 ` Ming Lei
2024-01-25 15:33 ` Jens Axboe
2024-01-26 14:10 ` Christoph Hellwig
2024-10-07 22:39 ` Bart Van Assche
2024-10-08 11:33 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ZbD7ups50ryrlJ/G@fedora \
--to=ming.lei@redhat.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-nvme@lists.infradead.org \
--cc=virtualization@lists.linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).