Re: [Xen-devel] Regression, host crash with 4.5rc1

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.11.14 at 21:07, <sflist@xxxxxxxxx> wrote:
> Running with mwait-idle=0 solves (hides?) the problem. Next step is to 
> fiddle with the C states?

So this also prompted me to go over the list of errata. Just to confirm
- your CPU is family 6 model 44? What stepping? And what nominal
frequency?

There are a couple potentially relevant errata (BC36, BC38, BC54,
BC77, BC110).

To exclude BC36, a boot log with "apic-verbosity=debug" and debug
key 'i' output would be necessary.

BC38 should not affect us since we don't enter C states from ISRs.

BC54 is probably irrelevant since we meanwhile know that your
system doesn't really hang hard.

For BC77 it would be worth trying to disable turbo mode instead of
disabling the mwait-idle driver ("xenpm disable-turbo-mode" right
after boot).

And BC110 would be relevant only if without the mwait-idle driver
there would be no use of C3. Plus anyway this would more likely end
up in a hard hang too.

And then, considering that my system with a family 6 model 44 CPU
has never shown anything similar (albeit that doesn't mean all that
much since our workloads are likely very different), you're not
over-clocking? And did you disable hyper-threading on purpose (if
so could you check whether enabling it makes a difference)?

Jan


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