linux-kernel - Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1]

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Message-ID: <45DDA43A.4030509@drzeus.cx>
Date:	Thu, 22 Feb 2007 15:10:02 +0100
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Luca Tettamanti <kronos.it@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1]

Arjan van de Ven wrote:
> 
> some can be used for both (PIT), but on a concept level the uses are
> independent. The advantage of local apic over PIT is that local apic is
> cheap to do "one shot" future events with, while the PIT will tick
> periodic at a fixed frequency. With tickless idle.. that's not what you
> want.
> 

So with a local apic, and acpi_pm as clocksource, I shouldn't be getting timer
interrupts? Yet I do. Which I assume means that the kernel will still get woken
up very often.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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