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Message-ID: <6ae04c15-e410-5ecc-660a-389fbb03d8ea@kernel.dk>
Date: Tue, 17 Dec 2019 17:02:57 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] io_uring: batch getting pcpu references
On 12/17/19 3:28 PM, Pavel Begunkov wrote:
> percpu_ref_tryget() has its own overhead. Instead getting a reference
> for each request, grab a bunch once per io_submit_sqes().
>
> basic benchmark with submit and wait 128 non-linked nops showed ~5%
> performance gain. (7044 KIOPS vs 7423)
Confirmed about 5% here as well, doing polled IO to a fast device.
That's a huge gain!
--
Jens Axboe
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