Re: measuring and/or dealing with "idleness" and variable frequency

[David Ahern <dsahern@gmail.com>]

On 6/10/13 4:28 PM, Rick Jones wrote:
>> I think I could get what I want from that - assuming I could get that to
>> a kernel I can use in my test env, but am guessing it is rather more
>> than I"m looking for at the moment.  I'm wondering if there might be a
>> simpler way to go - just get the idle loop to keep looping rather than
>> halt (?) the thread, so there would still be cycle events in the PMU?
>> (And perhaps set the system to a static, high-performance mode to avoid
>> frequency changes and maybe even disable HT?)
>
> Or, after having found
> https://www.kernel.org/doc/Documentation/kernel-parameters.txt, perhaps
> idle=poll?

Yes, that should turn the server into a power-sucking space heater and 
keep the cycles counter firing.

David