io-uring.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Hao Xu <haoxu@linux.alibaba.com>
To: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>,
	io-uring@vger.kernel.org
Cc: axboe@kernel.dk, asml.silence@gmail.com
Subject: Re: [RFC 3/3] io_uring: try to batch poll request completion
Date: Thu, 23 Sep 2021 01:09:25 +0800	[thread overview]
Message-ID: <5e5da6b6-f569-675c-74be-d3dc51fcea5e@linux.alibaba.com> (raw)
In-Reply-To: <2007b0f9-ddf7-44c7-7ef0-5cef5ff3d09b@linux.alibaba.com>

在 2021/9/23 上午1:01, Hao Xu 写道:
> 在 2021/9/23 上午1:00, Hao Xu 写道:
>> 在 2021/9/22 下午8:34, Xiaoguang Wang 写道:
>>> For an echo-server based on io_uring's IORING_POLL_ADD_MULTI feature,
>>> only poll request are completed in task work, normal read/write
>>> requests are issued when user app sees cqes on corresponding poll
>>> requests, and they will mostly read/write data successfully, which
>>> don't need task work. So at least for echo-server model, batching
>>> poll request completion properly will give benefits.
>>>
>>> Currently don't find any appropriate place to store batched poll
>>> requests, put them in struct io_submit_state temporarily, which I
>>> think it'll need rework in future.
>>>
>>> Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
>> We may need flush completion when io_submit_end as well, there may be
>> situations where pure poll reqs are sparse. For instance, users may
>> just use pure poll to do accept, and fast poll for read/write,
> I mean in persistent connection model.
>> send/recv, latency for pure poll reqs may amplify.
I actually think flush them in io_subimit_state_end doesn't work as well
since it is multishot req..


  reply	other threads:[~2021-09-22 17:09 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-22 12:34 [RFC 0/3] improvements for poll requests Xiaoguang Wang
2021-09-22 12:34 ` [RFC 1/3] io_uring: reduce frequent add_wait_queue() overhead for multi-shot poll request Xiaoguang Wang
2021-09-22 17:52   ` Hao Xu
2021-09-22 12:34 ` [RFC 2/3] io_uring: don't get completion_lock in io_poll_rewait() Xiaoguang Wang
2021-09-22 12:34 ` [RFC 3/3] io_uring: try to batch poll request completion Xiaoguang Wang
2021-09-22 16:24   ` Pavel Begunkov
2021-09-24  4:28     ` Xiaoguang Wang
2021-09-22 17:00   ` Hao Xu
2021-09-22 17:01     ` Hao Xu
2021-09-22 17:09       ` Hao Xu [this message]
2021-09-22 13:00 ` [RFC 0/3] improvements for poll requests Jens Axboe

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=5e5da6b6-f569-675c-74be-d3dc51fcea5e@linux.alibaba.com \
    --to=haoxu@linux.alibaba.com \
    --cc=asml.silence@gmail.com \
    --cc=axboe@kernel.dk \
    --cc=io-uring@vger.kernel.org \
    --cc=xiaoguang.wang@linux.alibaba.com \
    --subject='Re: [RFC 3/3] io_uring: try to batch poll request completion' \
    /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

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).