C states on AMD SMP

Erik Slagter
2005-09-08T11:29:16Z

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Hi,

I compiled & installed 2.6.13 (vanilla) on my Tyan Tiger S2466 (AMD768
chipset, 2xathlon MP 2600) yesterday. Indeed, as expected, acpi
"/proc/acpi/processor/*/power" (C states) is now supported on SMP. But,
to my surprise, it only shows one C state (C1), which, I assume, is
full-on. I am not completely sure about the CPU, but I do know that at
least the chipset supports C2 and C3 states (even got it sort of working
with pm_amd76x).

Can someone shine some light on this?

active state: C1
max_cstate: C8
bus master activity: 00000000
states:
*C1: type[C1] promotion[--] demotion[--]
latency[000] usage[59379522]

--- 8-< ----

processor : 1
vendor_id : AuthenticAMD
cpu family : 6
model : 8
model name : AMD Athlon(tm) Processor
stepping : 1
cpu MHz : 2133.515
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips : 4266.27

Thx.