linux-kernel - Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325

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Date:	Wed, 18 Jun 2008 10:02:14 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325

On Wed, 18 Jun 2008, Rafael J. Wysocki wrote:
> On Wednesday, 18 of June 2008, Rafael J. Wysocki wrote:
> > On Tuesday, 17 of June 2008, Rafael J. Wysocki wrote:
> > > On Tuesday, 17 of June 2008, Thomas Gleixner wrote:
> > > > On Tue, 17 Jun 2008, Rafael J. Wysocki wrote:
> > > > > 
> > > > > BTW, with the C1E patches reverted I don't get the
> > > > > WARNING: at /home/rafael/src/linux-next/kernel/smp.c:215 smp_call_function_single+0x3d/0xa2
> > > > > in the log.  Thomas?
> > > > 
> > > > Yeah, my bad. Fix below.
> > > 
> > > Thanks, it eliminates the WARNING, but still the box doesn't work with
> > > the "x86: add C1E aware idle function" patch applied, even with 'highres=off'.
> > > 
> > > The main symptom is that CPU loads are computed incorrectly (I got X using 126%
> > > of CPU time from 'top', for example).  Apart from this, some processes (like
> > > gkrellm) seem to be 'frozen' and only change their state in 'jumps', as though
> > > they only got CPU from time to time at random.
> > > 
> > > Reverting the above-mentioned patch fixes those problems.
> > 
> > Ah.  If your fix is replaced with the appended one, the system happily works
> > with C1E and highres.
> 
> Scratch that.  The symptoms appeared later this time, that's all.  I've just got
> b43 consuming 90+ % of the CPU time. :-(

I would have been pretty surprised if it had helped :)

Does the box boot when you disable the local apic timer on the kernel
command line with the patch applied ?

Also does forcing hpet change anything ?

Thanks,
	tglx


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