Li, Aubrey wrote: > Firstly, many thanks to report this bug, :-) > > Before we setup powertop bug track system on defect.opensolaris.org, > can we report bug to the mailing list first? > > my comments about this bug: > > This is a very good raise-up, really. But I think it'd better to place > this bug into Todo list. > Currently kernel doesn't support any mechanism to obtain the frequency > in the "turbo mode". > So, powertop can't report any related info. Actually hardware feedback > machanism exists on > the processor, We need to enable it. >
It is true that the APERF/MPERF hardware feedback mechanism can help to identify that a processor has been in "turbo mode". But unless I'm mistaken there is no guarantee that when the processor is in Turbo Mode that APERF/MPERF will catch it. Among other things, it would depend upon your polling interval - which currently is pretty long. What exactly would powertop report about 'turbo mode'? Amount of time spent in "turbo mode"? I think a metric like that is bound to be incorrect given the current hardware support isn't it? > Thanks, > -Aubrey > > >
