>Casper.Dik at Sun.COM wrote: >>> Any plans in the pipeline to support the "older" AMD procs like Athlon 64 >>> X2 4850E? >>> This feature does make a big difference in system power usage. When my >>> system runs Solaris is c ons >> umes 90 watt, and when it runs an OS (windows or linux) which does support >> this it consumes 68 w att >> >> Never. The powernow driver works for single CPU, single core. >> Solaris uses the TSC for almost everything and "fixing" that and >> making the wall clock sane is difficult. > >Would there be a way to support single-socket dual core systems as a >special case?
Same problem, I think. If someone have me a old 2 CORE CPU then I could make it work, ossibly. But not in "production" but only for my powernow driver. >I guess I'm not familar with whether a dual-core K8 chip changes >frequency for all cores at the same time (the voltage certainly changes >together). In which case, would a single socket dual-core case be >easier to support as a specific (but common) special case, if the two >cores change in lockstep? Easier, at least, than a multi-socket case >where the different sockets will get out of sync. Possibly, but the wall clock won't be accurate (if you are) >Or alternatively, would a DR-type solution work (drop all except one >core when transitioning to low-speed idle modes; then use powernow in >single-CPU mode)? On going back to full speed you'd re-enable the other >core(s). Don't know. Anyway, for Sun/Solaris, I don't think it is worth it. But for powernow "non-production" hack, I might get it to "workish" Casper