linux-kernel - Re: latest -git: WARNING: at arch/x86/kernel/ipi.c:123 send_IPI_mask

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Date:	Mon, 25 Aug 2008 20:31:04 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Dave Jones" <davej@...hat.com>, "H. Peter Anvin" <hpa@...nel.org>,
	"Andi Kleen" <andi@...stfloor.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Rusty Russell" <rusty@...tcorp.com.au>
Subject: Re: latest -git: WARNING: at arch/x86/kernel/ipi.c:123 send_IPI_mask_bitmask+0xc3/0xe0()

On Sun, Aug 24, 2008 at 8:13 PM, Dave Jones <davej@...hat.com> wrote:
> On Sun, Aug 24, 2008 at 07:45:48PM +0200, Vegard Nossum wrote:
>  > Why is MHz on 375!? I tried cpufreq-selector, but nothing changed. Maybe
>  >
>  > calling  acpi_cpufreq_init+0x0/0x90
>  > initcall acpi_cpufreq_init+0x0/0x90 returned -19 after 0 msecs
>
> -ENODEV.  Because you don't have frequency scaling capable CPU.
>
>  > Okay, now I used cpufreq-selector to change to "ondemand" governor,
>  > and MHz goes back to 3000. Weird. Why would "performance" governor put
>  > my machine to a constant 375?
>
> Probably because you're using p4-clockmod, and it's crap.

On Sun, Aug 24, 2008 at 7:59 PM, H. Peter Anvin <hpa@...nel.org> wrote:
> That would be a problem... I presume this problem is independent of the
> patch, though?

I sorted it -- thanks! It turned out to be pretty obscure; my tty
setting for the receiving end of the serial console was set to echo.
So when the machine booted, it was echoing lots of characters into the
Fedora 7 init, which would prompt for the starting of cpuspeed
initscript. Turning off echo for the tty was what triggered the
slowness; removing cpuspeed from the runlevel entirely solved the
problem.

Don't know why cpuspeed would select a governor which runs the CPU at
a constant 300 MHz, though.


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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