Re: Stop the continuous flood of (XEN) traps.c:2432:d0 Domain attempted WRMSR ..

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Fri, Feb 03, 2012 at 08:09:52PM +0200, Pasi Kärkkäinen wrote:
> Hello,
> 
> IIRC there was some discussion earlier about these messages in Xen's dmesg:
> 
> (XEN) traps.c:2432:d0 Domain attempted WRMSR 00000000000001ac from 0x0000000000c800c8 to 0x0000000080c880c8.
> (XEN) traps.c:2432:d0 Domain attempted WRMSR 00000000000001ac from 0x0000000000c800c8 to 0x0000000080c880c8.
> (XEN) traps.c:2432:d0 Domain attempted WRMSR 00000000000001ac from 0x0000000000c800c8 to 0x0000000080c880c8.
> (XEN) traps.c:2432:d0 Domain attempted WRMSR 00000000000001ac from 0x0000000000c800c8 to 0x0000000080c880c8.
> 
> At least on my systems there's continuous flood of those messages, so they will fill up the
> Xen dmesg log buffer and "xm dmesg" or "xl dmesg" won't show any valuable information, just those messages.

Is it always that MSR? That looks to be TURBO_POWER_CURRENT_LIMIT
which is the intel_ips driver doing.

> 
> I seem to be getting those messages even when there's only dom0 running.
> Is the plan to drop those messages? What's causing them? 

Looks to be the intel-ips. If you rename it does the issue disappear?
> 
> hmm, according to this bugzilla https://bugzilla.redhat.com/show_bug.cgi?id=470035,
> they're related to dom0 kernel acpi-cpufreq ?
> 
> Also it seems there was discussion about the subject on 2011/08:
> http://old-list-archives.xen.org/archives/html/xen-devel/2011-08/msg00561.html
> 
> 
> Xen hypervisor 4.1.2.
> dom0 Linux kernel 3.2.2.
> 
> 
> Thanks,
> 
> -- Pasi