[Linux-PowerEdge] 15 or 20 package_power_limit events per second on an R320

Paul Warner paul.warner at cyaninc.com
Wed Mar 20 01:27:31 CDT 2013

Based on this input as well as some advice from our Dell rep we disabled
"cstates" and "c1e".  This seemed to clear things up.  I guess from what I
read about what "c1e" does and what the power_limit evens from the kernel
suggest, it probably means we were stuck with too low a voltage to the CPU
I guess?  So not enough power to run at the proper rate?

Any ways, it is better.  Thanks.  We plan to update the BIOS and re-enable
and see if that still leaves us in a working state.  It sounds like "c1e"
at least used to reduce idle power consumption significantly at zero
performance impact, so it would be nice to have it enabled.


On Wed, Mar 13, 2013 at 11:27 PM, <Srinivas_G_Gowda at dell.com> wrote:

> You are probably seeing this because you might have set "Active power
> cap policy" in iDrac.
> Thanks,
> G
> On 03/14/2013 06:00 AM, Paul Warner wrote:
> > Any suggestions on what could be wrong?
> >
> > Ubuntu 12.04
> > 3.2.0-33-generic #52-Ubuntu SMP Thu Oct 18 16:29:15 UTC 2012 x86_64
> > x86_64 x86_64 GNU/Linux
> >
> > /sys/devices/system/cpu/cpu0/thermal_throttle/package_power_limit_count
> is
> > incrementing 15 or 20 times per second. core_power_limit_count is
> > similarly high.  Both values are around 1.2 million on
> >
> > my application is actually running, but things seem slow.
> >
> > we have maybe 30 servers like this.  I don't have ready access to all
> > of them since most are at customer sites, but I have seen this on a
> > few of them.  One was rebooted by front line customer support and now
> > it seems fine.
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