linux-kernel - Re: Re: [PATCH v5] Subject: io_uring: releasing CPU resources when polling

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Message-Id: <20240625083921.2579716-1-xue01.he@samsung.com>
Date: Tue, 25 Jun 2024 16:39:21 +0800
From: hexue <xue01.he@...sung.com>
To: axboe@...nel.dk
Cc: asml.silence@...il.com, io-uring@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH v5] Subject: io_uring: releasing CPU resources when
 polling

On 6/19/24 15:51, Jens Axboe wrote:
>On 6/19/24 08:18, hexue wrote:
>
>While I do suspect there are cases where hybrid polling will be more
>efficient, not sure there are many of them. And you're most likely
>better off just doing IRQ driven IO at that point? Particularly with the
>fairly substantial overhead of maintaining the data you need, and time
>querying.

I rebuilt the test cases based on your information, that is, each drive has
only one thread with high pressure, there is a significant performance loss.
I previously provided test data for a single drive with multi-threaded, which
can achieve performance stable and CPU savings.

Thanks for your data, I will reduce the cost of each IO and submit the next
version.

--
hexue