linux-kernel - Re: RFC: futex_wait() can DoS the tick

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Message-ID: <1434008596.3411.55.camel@gmail.com>
Date:	Thu, 11 Jun 2015 09:43:16 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: RFC: futex_wait() can DoS the tick

On Thu, 2015-06-11 at 09:35 +0200, Mike Galbraith wrote:
> On Wed, 2015-06-10 at 17:12 +0200, Thomas Gleixner wrote:
> 
> > I just booted a SNB with lapic=notscdeadline and ran that test
> > program. All what happens is - as expected - that ksoftirqd runs more
> > than we would like it to. I cannot observe any anomality vs. local
> > timer interrupts at all.
> 
> Ditto on a E5-4620 box this morning, no sign of it.  E5-2670 box I had
> verified "went away"

(dropped off the net on reboot, doesn't respond to remote button poking)

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