From: Jens Axboe <[email protected]>
To: David Wei <[email protected]>, [email protected]
Cc: Pavel Begunkov <[email protected]>
Subject: Re: [PATCH next v1 0/2] limit local tw done
Date: Wed, 20 Nov 2024 18:12:53 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 11/20/24 3:14 PM, David Wei wrote:
> Currently when running local tw it will eagerly try and complete all
> available work. When there is a burst of work coming in, the list of
> work in work_llist may be much larger than the requested batch count
> wait_nr. Doing all of the work eagerly may cause latency issues for some
> applications that do not want to spend so much time in the kernel.
>
> Limit the amount of local tw done to the max of 20 (a heuristic) or
> wait_nr. This then does not require any userspace changes.
>
> Many applications will submit and wait with wait_nr = 1 to mean "wait
> for _at least_ 1 completion, but do more work if available". This used
> to mean "all work" but now that is capped to 20 requests. If users want
> more work batching, then they can set wait_nr to > 20.
Looks good to me!
--
Jens Axboe
prev parent reply other threads:[~2024-11-21 1:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-20 22:14 [PATCH next v1 0/2] limit local tw done David Wei
2024-11-20 22:14 ` [PATCH next v1 1/2] io_uring: add io_local_work_pending() David Wei
2024-11-20 23:45 ` Pavel Begunkov
2024-11-20 22:14 ` [PATCH next v1 2/2] io_uring: limit local tw done David Wei
2024-11-20 23:56 ` Pavel Begunkov
2024-11-21 0:52 ` David Wei
2024-11-21 1:12 ` Jens Axboe
2024-11-21 1:12 ` Jens Axboe [this message]
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