[Skiboot] [PATCH] SLW: Add idle state stop5 for DD2.0 and above

Nicholas Piggin npiggin at gmail.com
Thu Nov 16 12:06:13 AEDT 2017

On Tue, 14 Nov 2017 18:52:09 +1100
Stewart Smith <stewart at linux.vnet.ibm.com> wrote:

> Akshay Adiga <akshay.adiga at linux.vnet.ibm.com> writes:
> > Adding stop5 idle state with rough residency and latency numbers.  
> How stable has stop5 proved? I gather this patch is an indication that
> we're fairly confident we have stop5 working well enough for an OS to
> use?
> Is there some way we could write a test from userspace to force a core
> into stop5 and out again a bunch of times? Maybe disable all other stop
> states, do nothing on it and then check?

Yes, disable all other stop states. You can do it at runtime with

You can then use context switch benchmark or some IO traffic etc
to really hammer it.


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