From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>,
io-uring@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 0/6] add persistent submission state
Date: Sat, 1 Feb 2020 01:32:17 +0300 [thread overview]
Message-ID: <199731e7-ca3f-ea6c-0813-6aa5dec6fa66@gmail.com> (raw)
In-Reply-To: <6492ccd2-e829-df13-ab6e-e62590375fd1@kernel.dk>
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On 01/02/2020 01:22, Jens Axboe wrote:
> On 1/31/20 3:15 PM, Pavel Begunkov wrote:
>> Apart from unrelated first patch, this persues two goals:
>>
>> 1. start preparing io_uring to move resources handling into
>> opcode specific functions
>>
>> 2. make the first step towards long-standing optimisation ideas
>>
>> Basically, it makes struct io_submit_state embedded into ctx, so
>> easily accessible and persistent, and then plays a bit around that.
>
> Do you have any perf/latency numbers for this? Just curious if we
> see any improvements on that front, cross submit persistence of
> alloc caches should be a nice sync win, for example, or even
> for peak iops by not having to replenish the pool for each batch.
>
> I can try and run some here too.
>
I tested the first version, but my drive is too slow, so it was only nops and
hence no offloading. Honestly, there waren't statistically significant results.
I'll rerun anyway.
I have a plan to reuse it for a tricky optimisation, but thinking twice, I can
just stash it until everything is done. That's not the first thing in TODO and
will take a while.
--
Pavel Begunkov
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next prev parent reply other threads:[~2020-01-31 22:33 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-31 22:15 [PATCH v3 0/6] add persistent submission state Pavel Begunkov
2020-01-31 22:15 ` [PATCH v3 1/6] io_uring: always pass non-null io_submit_state Pavel Begunkov
2020-01-31 22:15 ` [PATCH v3 2/6] io_uring: place io_submit_state into ctx Pavel Begunkov
2020-01-31 22:15 ` [PATCH v3 3/6] io_uring: move ring_fd into io_submit_state Pavel Begunkov
2020-01-31 22:15 ` [PATCH v3 4/6] io_uring: move *link " Pavel Begunkov
2020-01-31 22:15 ` [PATCH v3 5/6] io_uring: persistent req bulk allocation cache Pavel Begunkov
2020-01-31 22:15 ` [PATCH v3 6/6] io_uring: optimise " Pavel Begunkov
2020-01-31 22:22 ` [PATCH v3 0/6] add persistent submission state Jens Axboe
2020-01-31 22:32 ` Pavel Begunkov [this message]
2020-02-01 0:31 ` Pavel Begunkov
2020-02-01 2:10 ` Jens Axboe
2020-02-01 11:42 ` Pavel Begunkov
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