> On Thu, Oct 30, 2008 at 2:06 PM, MinChan Kim <minchan.kim@xxxxxxxxx> wrote: >> Hi, all, >> >> I want to test CPUfreq function in AMD opteron quad-core series. >> But I am not sure linux in now can support CPUfreq for ADM opteron by per core ? >> What I mean is not controling to put together 2 core by one package >> but control by per core. >> After all, I want to control all 4 cpu separetely. >> >> Is is possible? If it is possible, What kinds of model can support ? All Quad-Core AMD Opterons support using a separate CPU frequency per core. All four cores are all independent, but afaik you'll only get a reduction in voltage based on the highest speed of all four cores. You may want to ensure you get a motherboard with DDPM so the CPU and memory controller power is independent. http://www.tyan.com/tech/ddpm.aspx Make sure you use a recent kernel which handles C1E properly. On 31/10/08 03:06, Peter Teoh wrote: > check this out: > > http://osdir.com/ml/kernel.cpufreq/2004-07/msg00012.html > > from the reply, since the power management flag is at the per-core > level (check /proc/cpuinfo), all control can be done at the per-core > level, hard-ware wise. (not sure of Linux Kernel itself) > > But at least 4 flags must be present (read above email): ts, ttp, fid, vid. > > I must also say this is the first time I am aware of these flags too :-). Don't top post. I've never heard of these flags - that email is from 2004. model name : Quad-Core AMD Opteron(tm) Processor 2354 flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good pni monitor cx16 lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs [ 5.569030] powernow-k8: 0 : pstate 0 (2200 MHz) [ 5.569136] powernow-k8: 1 : pstate 1 (2000 MHz) [ 5.569233] powernow-k8: 2 : pstate 2 (1700 MHz) [ 5.569330] powernow-k8: 3 : pstate 3 (1400 MHz) [ 5.569434] powernow-k8: 4 : pstate 4 (1100 MHz) -- Simon Arlott _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
