Hi. I just tried powertop and noticed a few issues when running it on my
single-core Turion 64 laptop (ATI IXP chipset) with a 64-bit 2.6.23-hrt1 kernel
(2.6.23 with patchset from
http://www.kernel.org/pub/linux/kernel/people/tglx/hrtimers/2.6.23/)
1. The processor never enters any C-states apart from C0, not even if I run in
console mode with all non-essential kernel modules and programs stopped.
Booting with various combinations of "noapic nolapic nolapic_timer" doesn't
help either. Why is this? It seems like my processor should support C-states:
# cat /proc/acpi/processor/C000/power
active state: C0
max_cstate: C8
bus master activity: 00000000
maximum allowed latency: 8000 usec
states:
C1: type[C1] promotion[--] demotion[--] latency[000]
usage[00000000] duration[00000000000000000000]
C2: <not supported>
C3: type[C3] promotion[--] demotion[--] latency[010]
usage[00000000] duration[00000000000000000000]
# cat /proc/acpi/processor/C000/info
processor id: 0
acpi id: 1
bus mastering control: yes
power management: yes
throttling control: yes
limit interface: yes
2. I'm not sure that HPET is actually enabled. I did select it in the kernel
config, but there's nothing about HPET in the logs. How can I tell for sure?
Kernel config:
# grep HZ /boot/config-2.6.23-hrt1
CONFIG_NO_HZ=y
# CONFIG_HZ_100 is not set
CONFIG_HZ_250=y
# CONFIG_HZ_300 is not set
# CONFIG_HZ_1000 is not set
CONFIG_HZ=250
# grep HPET /boot/config-2.6.23-hrt1
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
CONFIG_HPET=y
# CONFIG_HPET_RTC_IRQ is not set
CONFIG_HPET_MMAP=y
Thanks in advance,
Johan
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