Re: [Xen-devel] Stop the continuous flood of (XEN) traps.c:2432:d0 Domain attempted WRMSR ..

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Feb 03, 2012 at 01:55:27PM -0500, Konrad Rzeszutek Wilk wrote:
> 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.
> 

Yeah, it's always the same..

> > 
> > 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?

I just did "rmmod intel_ips" and the flood stopped.. 


Btw on baremetal I get this in dmesg:

[  745.033645] CPU1: Core temperature above threshold, cpu clock throttled 
(total events = 1)
[  745.033652] CPU3: Core temperature above threshold, cpu clock throttled 
(total events = 1)
[  745.034676] CPU1: Core temperature/speed normal
[  745.034678] CPU3: Core temperature/speed normal
[  849.678508] intel ips 0000:00:1f.6: MCP limit exceeded: Avg temp 9682, limit 
9000
[  899.614074] intel ips 0000:00:1f.6: MCP limit exceeded: Avg temp 9896, limit 
9000
[  899.722881] [Hardware Error]: Machine check events logged
[ 1172.675987] CPU3: Core temperature above threshold, cpu clock throttled 
(total events = 78)
[ 1172.675990] CPU1: Core temperature above threshold, cpu clock throttled 
(total events = 78)
[ 1172.677038] CPU1: Core temperature/speed normal
[ 1172.677042] CPU3: Core temperature/speed normal
[ 1174.260050] intel ips 0000:00:1f.6: MCP limit exceeded: Avg temp 9676, limit 
9000
[ 1199.339634] [Hardware Error]: Machine check events logged


-- Pasi


> > 
> > 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

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