Tickless kernel and C-states on Turion 64

[Jan Willies]

Johan Brannlund wrote:
> 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?

I have a Turion64/ATI IXP too and experienced the same issues with hrt 
patchkit. Without hrt patches, everything is fine. I'm not using 64bit.

> 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:

cat /sys/devices/system/clocksource/clocksource0/current_clocksource


- Jan