on 18/11/2010 15:38 Daniel Nebdal said the following: > Just for the sake of gathering information here: > What they offer are two (64-bit, wrapping) counters; one that > increases at a constant rate, and one that increases in proportion to > the current performance of the CPU, so that APERF/MPERF = fraction of > max possible performance the CPU has offered since the last time the > counters were zeroed. Intel specifically suggests multiplying that > with the observed CPU load over the same time period to get an > absolute CPU load number, and using that to pick a suitable P-state. > > On a tangent, I wonder if you can get APERF>MPERF if you're using an > i5/i7 and their dynamic/automatic overclocking kicks in?
Yes, I believe so. At the very least AMD explicitly documents that to be the case when Core Performance Boost feature is activated. > As for what to do with it, it sounds like it would make sense as an > alternate data source for powerd? Yes, indeed. -- Andriy Gapon _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
