linux-kernel - Re: [PATCH] io_uring: Use io

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Message-ID: <5f303931-40d3-2133-9085-62440f8b0666@kernel.dk>
Date:   Mon, 24 Jul 2023 11:44:32 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Andres Freund <andres@...razel.de>
Cc:     Phil Elwell <phil@...pberrypi.com>, asml.silence@...il.com,
        david@...morbit.com, hch@....de, io-uring@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, linux-xfs@...r.kernel.org,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH] io_uring: Use io_schedule* in cqring wait

On 7/24/23 11:24?AM, Andres Freund wrote:
> Hi,
> 
> On 2023-07-24 09:16:56 -0700, Andres Freund wrote:
>> Building a kernel to test with the patch applied, will reboot into it once the
>> call I am on has finished. Unfortunately the performance difference didn't
>> reproduce nicely in VM...
> 
> Performance is good with the patch applied. Results are slightly better even,
> but I think that's likely just noise.

Could be - it's avoiding a few function calls and the flush, but would
probably have to be a pretty targeted test setup to find that for
storage IO. Thanks for testing!

-- 
Jens Axboe