linux-kernel - Re: 3.14.23-rt20 - softirq: resurrect softirq threads

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Date:	Tue, 17 Feb 2015 15:00:20 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Carsten Emde <C.Emde@...dl.org>,
	John Kacur <jkacur@...hat.com>,
	Clark Williams <williams@...hat.com>
Subject: Re: 3.14.23-rt20 - softirq: resurrect softirq threads

On Tue, 2015-02-17 at 14:05 +0100, Sebastian Andrzej Siewior wrote:
> * Mike Galbraith | 2014-11-02 08:31:47 [+0100]:
> 
> >(sirqs suck, this makes them suck less for some boxen/loads)
> >
> >Subject: softirq: resurrect softirq threads
> >From: Mike Galbraith <mgalbraith@...e.de>
> >Date: Mon Jan  6 08:42:11 CET 2014
> >
> >Some loads cannot tolerate the jitter induced by all softirqs being processed
> >at the same priority.  Let the user prioritize them again.
> >
> >Signed-off-by: Mike Galbraith <mgalbraith@...e.de>
> 
> I'm going to postpone this. While it might make sense in general I'm
> going to wait for tglx, Steven and others to see if this is what we want
> or if there are some plans redoing the softirq handling.

You can postpone this one forever, they don't want it.  I posted it for
folks who may want the option.

	-Mike

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