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

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Message-ID: <1434008159.3411.50.camel@gmail.com>
Date:	Thu, 11 Jun 2015 09:35:59 +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 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" when I put master on it this morning, but that
doesn't matter much, having deadline timer feature alone definitely
doesn't mean box can be convinced to reproduce the stall.  Hohum.

	-Mike


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