We resolved similar issue by upgrading BIOS.

Sent from my iPod

> On Sep 23, 2016, at 5:20 PM, Adam Richmond-Gordon 
> <soc...@themisanthrope.co.uk> wrote:
> 
> Hello all,
> 
> I (seem to) remember some time ago that the general advice was to disable 
> power management where possible. Is this still correct, or have I been 
> imagining this all along?
> 
> I recently took delivery of a box with an E5 v4 CPU, and SmartOS would panic 
> on boot due to expecting the `mwait` CPU feature. I have managed to get the 
> box to boot by allowing C0-C2 states, but it is somewhat unstable.
> Although I do think this is quite likely to be a hardware issue, which CPU 
> power management features can SmartOS actually take advantage of, and what is 
> recommended?
> 
> I plan to open an RMA for the box next week, but it’s probably worth making 
> sure that my running configuration is actually valid, first.
> 
> If memory serves me correctly, the CPU and board firmware can support a 
> variety of C-, T- and P-states, amongst other features that either aren’t 
> selectable or don’t exist on other hardware I have.
> 
> Adam
> 


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