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

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Message-ID: <Pine.LNX.4.61.0702221334460.28624@yvahk01.tjqt.qr>
Date:	Thu, 22 Feb 2007 13:36:43 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Luca Tettamanti <kronos.it@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1]


On Feb 22 2007 00:17, Thomas Gleixner wrote:
>On Thu, 2007-02-22 at 00:04 +0100, Luca Tettamanti wrote:
>> 
>> Interrupt 0 is stuck at 114 (the number is consistent across reboots). I
>> don't experience any problem, time is running fine. Still it's strange
>> that the timer is doing nothing; maybe something other than the PIT is
>> used for time keeping?
>
>Yes, we switch away from PIT and use the local APIC timer. (LOC)

What's the benefit of doing so - and why has not it been done before?
I mean, I run a regular 2.6.18.6,
/sys/devices/system/clocksource/clocksource0/current_clocksource (is this
related?) shows "acpi_pm", but the IRQ0 counter increases at HZ. Maybe I
am confusing things, but why the need for PIT when clocksource is acpi_pm
anyway?


Jan
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