Bug 15896

Output during boot:

powernow-k8: Found 1 AMD Phenom(tm) II X6 1090T Processor processors (6 cpu cores) (version 2.20.00)
powernow-k8:    0 : pstate 0 (3600 MHz)
powernow-k8:    1 : pstate 1 (3200 MHz)
powernow-k8:    2 : pstate 2 (2400 MHz)
powernow-k8:    3 : pstate 3 (1600 MHz)

My understanding of AMD's Turbo Core is that the 3.6GHz p-state 0 is supposed to be a hidden hardware p-state and that the OS kernel should see hw p-state 1 (3.2GHz) as it's p-state 0.

My expectation is to see:
p-state 0: 3200 MHz
p-state 1: 2400 MHz
p-state 2: 1600 MHz
p-state 3:  800 MHz

Note: the lowest clock 800MHz is missing from the list output by powernow-k8. 

I am running this on a Gigabyte GA-890GPA-UD3H v1 board with the latest non-beta bios F6. The bios does support, and recognize, the 1090T processor. I do have the Turbo Core option enabled in the bios.

While cpufreq does identify the hw p-state 3600MHz, it does not use it. I have run mprime with 1 thread and with 6 and there is never any time recorded for 3600MHz. When under full load, cores run at 3200MHz, which is expected.