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

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Date:	Sun, 24 Aug 2008 14:13:04 -0400
From:	Dave Jones <davej@...hat.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	"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 07:45:48PM +0200, Vegard Nossum wrote:
 > Removing acpi=off helps with the CPU detection problem. The kernel is
 > still really slow, though. From /proc/cpuinfo:
 > 
 > processor       : 1
 > vendor_id       : GenuineIntel
 > cpu family      : 15
 > model           : 6
 > model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
 > stepping        : 5
 > cpu MHz         : 375.000
 > cache size      : 2048 KB
 > 
 > 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.

	Dave

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