netdev - Re: [PATCH] net: Handle threadirqs in __napi_schedule

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Message-ID: <0735aa31-3fc0-4767-9372-23509df751df@linux.dev>
Date: Fri, 13 Sep 2024 12:19:05 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: "David S . Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
 Juri Lelli <juri.lelli@...hat.com>, Thomas Gleixner <tglx@...utronix.de>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: Handle threadirqs in __napi_schedule_irqoff

On 9/13/24 12:14, Sebastian Andrzej Siewior wrote:
> On 2024-09-13 11:09:54 [-0400], Sean Anderson wrote:
>> The threadirqs kernel parameter can be used to force threaded IRQs even
>> on non-PREEMPT_RT kernels. Use force_irqthreads to determine if we can
>> skip disabling local interrupts. This defaults to false on regular
>> kernels, and is always true on PREEMPT_RT kernels.
> 
> Is this fixing a behaviour or is this from the clean up/ make it pretty
> category?

It's in response to [1].

[1] https://lore.kernel.org/netdev/20240912084322.148d7fb2@kernel.org/

> The forced-threaded interrupts run with disabled interrupts on !RT so
> this change should not fix anything.

OK, so maybe this isn't necessary at all?

--Sean