linux-kernel - Re: [RFC][PATCH 1/2] sched: Extended scheduler time slice

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Message-ID: <20250210165840.7dd1dced@gandalf.local.home>
Date: Mon, 10 Feb 2025 16:58:40 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: David Laight <david.laight.linux@...il.com>
Cc: Joel Fernandes <joel@...lfernandes.org>, Prakash Sangappa
 <prakash.sangappa@...cle.com>, Peter Zijlstra <peterz@...radead.org>,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, Thomas
 Gleixner <tglx@...utronix.de>, Ankur Arora <ankur.a.arora@...cle.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, linux-mm@...ck.org,
 x86@...nel.org, Andrew Morton <akpm@...ux-foundation.org>, luto@...nel.org,
 bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
 juri.lelli@...hat.com, vincent.guittot@...aro.org, willy@...radead.org,
 mgorman@...e.de, jon.grimm@....com, bharata@....com,
 raghavendra.kt@....com, Boris Ostrovsky <boris.ostrovsky@...cle.com>,
 Konrad Wilk <konrad.wilk@...cle.com>, jgross@...e.com,
 Andrew.Cooper3@...rix.com, Vineeth Pillai <vineethrp@...gle.com>, Suleiman
 Souhlal <suleiman@...gle.com>, Ingo Molnar <mingo@...nel.org>, Mathieu
 Desnoyers <mathieu.desnoyers@...icios.com>, Clark Williams
 <clark.williams@...il.com>, bigeasy@...utronix.de, daniel.wagner@...e.com,
 Joseph Salisbury <joseph.salisbury@...cle.com>, broonie@...il.com
Subject: Re: [RFC][PATCH 1/2] sched: Extended scheduler time slice

On Mon, 10 Feb 2025 21:51:16 +0000
David Laight <david.laight.linux@...il.com> wrote:

> And then you lose lots of receive ethernet packets unless you change
> all the thread priorities.
> (I don't recall anything that makes them run at a low FIFO prioriry.)

Interrupt threads by default run at FIFO 50.

The softirqs will run with the threads that raise them so at the same
priority. See "sched_set_fifo()".

-- Steve