From: Jens Axboe <[email protected]>
To: Pavel Begunkov <[email protected]>, [email protected]
Subject: Re: [PATCH 00/16] squeeze more performance
Date: Mon, 4 Oct 2021 14:19:39 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 10/4/21 1:02 PM, Pavel Begunkov wrote:
> fio/t/io_uring -s32 -d32 -c32 -N1
>
> | baseline | 0-15 | 0-16 | diff
> setup 1: | 34 MIOPS | 42 MIOPS | 42.2 MIOPS | 25 %
> setup 2: | 31 MIOPS | 31 MIOPS | 32 MIOPS | ~3 $
>
> Setup 1 gets 25% performance improvement, which is unexpected and a
> share of it should be accounted as compiler/HW magic. Setup 2 is just
> 3%, but the catch is that some of the patches _very_ unexpectedly sink
> performance, so it's more like 31 MIOPS -> 29 -> 30 -> 29 -> 31 -> 32
>
> I'd suggest to leave 16/16 aside, maybe for future consideration and
> refinement. The end result is not very clear, I'd expect probably
> around 3-5% with a more stable setup for nops32, and a better win
> for io_cqring_ev_posted() intensive cases like BPF.
Looks and tests good for me. I've skipped 16/16 for now, we can
evaluate that one later.
--
Jens Axboe
next prev parent reply other threads:[~2021-10-04 20:19 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-04 19:02 [PATCH 00/16] squeeze more performance Pavel Begunkov
2021-10-04 19:02 ` [PATCH 01/16] io_uring: optimise kiocb layout Pavel Begunkov
2021-10-04 19:02 ` [PATCH 02/16] io_uring: add more likely/unlikely() annotations Pavel Begunkov
2021-10-04 19:02 ` [PATCH 03/16] io_uring: delay req queueing into compl-batch list Pavel Begunkov
2021-10-04 19:02 ` [PATCH 04/16] io_uring: optimise request allocation Pavel Begunkov
2021-10-04 19:02 ` [PATCH 05/16] io_uring: optimise INIT_WQ_LIST Pavel Begunkov
2021-10-04 19:02 ` [PATCH 06/16] io_uring: don't wake sqpoll in io_cqring_ev_posted Pavel Begunkov
2021-10-04 19:02 ` [PATCH 07/16] io_uring: merge CQ and poll waitqueues Pavel Begunkov
2021-10-04 19:02 ` [PATCH 08/16] io_uring: optimise ctx referencing by requests Pavel Begunkov
2021-10-04 19:02 ` [PATCH 09/16] io_uring: mark cold functions Pavel Begunkov
2021-10-04 19:02 ` [PATCH 10/16] io_uring: optimise io_free_batch_list() Pavel Begunkov
2021-10-04 19:02 ` [PATCH 11/16] io_uring: control ->async_data with a REQ_F flag Pavel Begunkov
2021-10-04 19:02 ` [PATCH 12/16] io_uring: remove struct io_completion Pavel Begunkov
2021-10-04 19:02 ` [PATCH 13/16] io_uring: inline io_req_needs_clean() Pavel Begunkov
2021-10-04 19:02 ` [PATCH 14/16] io_uring: inline io_poll_complete Pavel Begunkov
2021-10-04 19:03 ` [PATCH 15/16] io_uring: correct fill events helpers types Pavel Begunkov
2021-10-04 19:03 ` [PATCH 16/16] io_uring: mark hot functions Pavel Begunkov
2021-10-04 20:19 ` Jens Axboe [this message]
2021-10-04 20:33 ` [PATCH 00/16] squeeze more performance Jens Axboe
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