linux-kernel - Re: [patch] clockevents: drivers for i386, fix #2

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Date:	Wed, 4 Oct 2006 00:32:28 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, Jim Gettys <jg@...top.org>,
	John Stultz <johnstul@...ibm.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: [patch] clockevents: drivers for i386, fix #2

On Wed, 4 Oct 2006 08:46:20 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Andrew Morton <akpm@...l.org> wrote:
> 
> > Disabling LOCAL_APIC does fix it.
> 
> thanks, that narrows it down quite a bit. (We've double-checked the 
> lapic path and it seemed all our changes are NOP, but obviously it isnt 
> and we'll check it all again.)
> 
> (if you have that kernel still booted by any chance then do you see the 
> 'LOC' IRQ count in /proc/interrupts or any other count in /proc/stats 
> increasing at an alarming rate? That would narrow it down to lapic timer 
> misprogramming.)
> 

None of the interrupts are doing anything wrong.  oprofile shows nothing
alarming.

Disabling cpufreq in config doesn't fix it.

Userspace can count to a billion in 3.9 seconds when this problem is
present, which is the same time as it takes on a non-slow kernel.

`sleep 5' takes 5 seconds.

Yet initscripts take a long time (especially applying the ipfilter firewall
rues for some reason), and `startx' takes a long time, etc.  This kernel
takes 112 seconds to boot to a login prompt - other kernels take 56 seconds
(interesting ratio..)

Weird.
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