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From: Hao Xu <[email protected]>
To: Pavel Begunkov <[email protected]>,
	Jens Axboe <[email protected]>,
	[email protected]
Subject: Re: [PATCH v2 1/1] io_uring: allocate memory for overflowed CQEs
Date: Wed, 24 Feb 2021 11:06:51 +0800	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <a5e833abf8f7a55a38337e5c099f7d0f0aa8746d.1614083504.git.asml.silence@gmail.com>

在 2021/2/23 下午8:40, Pavel Begunkov 写道:
> Instead of using a request itself for overflowed CQE stashing, allocate
> a separate entry. The disadvantage is that the allocation may fail and
> it will be accounted as lost (see rings->cq_overflow), so we lose
> reliability in case of memory pressure. However, it opens a way for for
> multiple CQEs per an SQE and even generating SQE-less CQEs >
> Signed-off-by: Pavel Begunkov <[email protected]>
> ---
Hi Pavel,
Allow me to ask a stupid question, why do we need to support multiple 
CQEs per SQE or even SQE-less CQEs in the future?

Thanks,
Hao

  parent reply	other threads:[~2021-02-24  3:07 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23 12:40 [PATCH v2 1/1] io_uring: allocate memory for overflowed CQEs Pavel Begunkov
2021-02-23 14:22 ` Jens Axboe
2021-02-23 15:36   ` Pavel Begunkov
2021-02-24  3:06 ` Hao Xu [this message]
2021-02-24  3:18   ` Jens Axboe
2021-02-24  3:47     ` Hao Xu
2021-02-24  9:39     ` Pavel Begunkov

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