linux-kernel - Re: [PATCH v5 0/2] io_uring: Add support for napi_busy

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Message-ID: <b0b2c07eb3b7acad02159e0db145a5b4e825b026.camel@trillion01.com>
Date:   Wed, 09 Mar 2022 00:47:30 -0500
From:   Olivier Langlois <olivier@...llion01.com>
To:     Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>
Cc:     Hao Xu <haoxu@...ux.alibaba.com>,
        io-uring <io-uring@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 0/2] io_uring: Add support for napi_busy_poll

On Tue, 2022-03-08 at 17:54 -0700, Jens Axboe wrote:
> On 3/8/22 3:17 PM, Olivier Langlois wrote:
> > The sqpoll thread can be used for performing the napi busy poll in
> > a
> > similar way that it does io polling for file systems supporting
> > direct
> > access bypassing the page cache.
> > 
> > The other way that io_uring can be used for napi busy poll is by
> > calling io_uring_enter() to get events.
> > 
> > If the user specify a timeout value, it is distributed between
> > polling
> > and sleeping by using the systemwide setting
> > /proc/sys/net/core/busy_poll.
> 
> I think we should get this queued up, but it doesn't apply to
> for-5.18/io_uring at all. I can fix it up, but just curious what you
> tested against?
> 
Hi Jens,

I did wrote the patch from
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

My testing systems are based on 5.16. I have backported the patch and
compiled 5.16.12 with the patch for my testing.

sorry if I didn't use the right repo...