linux-kernel - Re: 2.6.25 slow boot/reboot

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Message-ID: <20080429142819.GF26461@elte.hu>
Date:	Tue, 29 Apr 2008 16:28:19 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Glauber Costa <gcosta@...hat.com>
Cc:	Sergio Luis <sergio@...ces.uece.br>,
	Ken Moffat <zarniwhoop@...world.com>,
	Bart Van Assche <bart.vanassche@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.25 slow boot/reboot


* Glauber Costa <gcosta@...hat.com> wrote:

> [    1.375711] Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ 
> sharing enabled
> [    4.399907] floppy0: no floppy controllers found
>
> a 90-second delay is not what's happening, or at least, not what the 
> kernel is seeing. So my bet would be something clock-related. Probably 
> the system's clocksource is not running the time correctly, which is 
> causing system events to be delayed. I fail to see, however, how does 
> the patch you bisected to influences this. Ingo, do you have any idea?

the first thing to check, does latest x86.git work fine:

  http://people.redhat.com/mingo/x86.git/README

? We've got fixes queued up - in particular one could result in 'slow' 
systems by virtue of denying an ioremap():

  Subject: revert: "x86: ioremap(), extend check to all RAM pages"

maybe the bisection went haywire.

Or the secondary core booted up in such a sucky way that it causes such 
massive slowdowns? Perhaps we are flooding the system with local APIC 
timer interrupts or other interrupts?

	Ingo
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