public inbox for [email protected]
 help / color / mirror / Atom feed
From: Willem de Bruijn <[email protected]>
To: Pavel Begunkov <[email protected]>,
	 [email protected],  [email protected]
Cc: Jens Axboe <[email protected]>,
	 [email protected],
	 "David S . Miller" <[email protected]>,
	 Jakub Kicinski <[email protected]>,
	 David Ahern <[email protected]>,
	 Eric Dumazet <[email protected]>,
	 Willem de Bruijn <[email protected]>
Subject: Re: [RFC 6/6] io_uring/notif: implement notification stacking
Date: Sun, 14 Apr 2024 13:10:32 -0400	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <3e2ef5f6d39c4631f5bae86b503a5397d6707563.1712923998.git.asml.silence@gmail.com>

Pavel Begunkov wrote:
> The network stack allows only one ubuf_info per skb, and unlike
> MSG_ZEROCOPY, each io_uring zerocopy send will carry a separate
> ubuf_info. That means that send requests can't reuse a previosly
> allocated skb and need to get one more or more of new ones. That's fine
> for large sends, but otherwise it would spam the stack with lots of skbs
> carrying just a little data each.

Can you give a little context why each send request has to be a
separate ubuf_info?

This patch series aims to make that model more efficient. Would it be
possible to just change the model instead? I assume you tried that and
it proved unworkable, but is it easy to explain what the fundamental
blocker is?

MSG_ZEROCOPY uses uarg->len to identify multiple consecutive send
operations that can be notified at once.

  reply	other threads:[~2024-04-14 17:10 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-12 12:55 [RFC 0/6] implement io_uring notification (ubuf_info) stacking Pavel Begunkov
2024-04-12 12:55 ` [RFC 1/6] net: extend ubuf_info callback to ops structure Pavel Begunkov
2024-04-13 17:17   ` David Ahern
2024-04-14 17:07   ` Willem de Bruijn
2024-04-15  0:07     ` Pavel Begunkov
2024-04-15 15:06       ` Willem de Bruijn
2024-04-15 18:55         ` Pavel Begunkov
2024-04-15 19:01           ` Willem de Bruijn
2024-04-16 14:50       ` David Ahern
2024-04-16 15:31         ` Pavel Begunkov
2024-04-12 12:55 ` [RFC 2/6] net: add callback for setting a ubuf_info to skb Pavel Begunkov
2024-04-13 17:18   ` David Ahern
2024-04-12 12:55 ` [RFC 3/6] io_uring/notif: refactor io_tx_ubuf_complete() Pavel Begunkov
2024-04-12 12:55 ` [RFC 4/6] io_uring/notif: remove ctx var from io_notif_tw_complete Pavel Begunkov
2024-04-12 12:55 ` [RFC 5/6] io_uring/notif: simplify io_notif_flush() Pavel Begunkov
2024-04-12 12:55 ` [RFC 6/6] io_uring/notif: implement notification stacking Pavel Begunkov
2024-04-14 17:10   ` Willem de Bruijn [this message]
2024-04-14 23:55     ` Pavel Begunkov
2024-04-15 15:15       ` Willem de Bruijn
2024-04-15 18:51         ` Pavel Begunkov
2024-04-15 19:02           ` Willem de Bruijn
2024-04-12 13:44 ` [RFC 0/6] implement io_uring notification (ubuf_info) stacking Jens Axboe
2024-04-12 14:52 ` Jens Axboe
2024-04-13 17:17 ` David Ahern
2024-04-15  0:08   ` Pavel Begunkov

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=661c0e083f05e_3e77322946e@willemb.c.googlers.com.notmuch \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    /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