Li, Aubrey wrote: > Vinay Devadas wrote: > > >> Hi Jim, >> >> I just had a question about the bug you reported about Turbo >> Mode not being supported on PowerTop. Wanted to clarify what >> sort of statistic did you have in mind when you reported the >> bug. With the observability provided by intel, I believe we >> can only say we were in turbo mode for some time during the >> last sampling interval. We feel the average CPU frequency >> overall the last sampling interval may be a more useful >> statistic. Please let us know on what you think. >> >> > I guess we already discussed this issue before? > Turbo mode is exported as P0 = marked frequency + 1Mhz, > but allow the processors to run faster so that the performance can > be improved up to 20%. Average CPU frequency is doable by the > hardware feedback mechanism. >
I think that Vinay was asking Jim about the RFE that he added to http://www.opensolaris.org/os/project/tesla/Work/Powertop/ As I think you and I discussed on the alias earlier, the average CPU frequency while in P0 can be determined by strategically placing APERF/MPERF value dtrace probes when transitioning to and from P0. At least that would be the first thing I'd try ... > Thanks, > -Aubrey > _______________________________________________ > tesla-dev mailing list > tesla-dev at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/tesla-dev >
