runaway intr problems: powerd and/or hw.acpi.cpu.cx_lowest related

John Baldwin jhb at
Mon Aug 23 12:40:38 UTC 2010

On Sunday, August 22, 2010 11:17:44 pm Doug Barton wrote:
> Thanks to help from Andriy I've been working on narrowing down the cause 
> of my "runaway intr" problems and we've found some interesting things. 
> First, if I use neither powerd nor set hw.acpi.cpu.cx_lowest less than 
> C1 things seem to work fine. Using one or the other sort of works, but 
> between the 2 powerd seems to cause the most problems.

I think this just means that when C3 is enabled the system is getting skewed 
results in cp_time[] and so the stats are off.  The system isn't actually 
stuck in an interrupt storm of sorts, the numbers reported to top are just 
wrong so it looks like it is.

John Baldwin

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