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From: Hao Xu <>
To: Xiaoguang Wang <>,
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: <> (raw)
In-Reply-To: <>

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 <>
>> 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

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