Force HPET patch for 2.6.22 kernel?

[moltonel 3x Combo]

On 9/15/07, Kyle Cunningham <kyle at codeincarnate.com> wrote:
> Is there a patch that applies cleanly to 2.6.22.x kernels to
> force HPET on.
[...]
> 35.9% ( 66.0)       <interrupt> : extra timer interrupt
> 23.2% ( 42.7)       <interrupt> : eth0, i915 at pci:0000:00:02.0
> 11.3% ( 20.7)       <interrupt> : libata
> 5.4% ( 10.0)       <interrupt> : Intel ICH6, ipw2200
> 5.3% (  9.7)   hald-addon-cpuf : cpufreq_governor_dbs
> (delayed_work_timer_fn)
> 4.0% (  7.3)       <interrupt> : acpi
> 3.4% (  6.3)            kicker : schedule_timeout (process_timeout)
> 2.0% (  3.7)              Xorg : do_setitimer (it_real_fn)

I'm sure there's an HPET patch floating around, but if I understand
things correctly it wouldn't help your system at all, since you are
way over the 30+ wakeups per seconds where HPET can do better than the
other timers.

On the other hand, you have lots of extra timer interrupts. Did you
not enable NO_HZ because you are using a 64bit arch ? In this case, a
"64bit NO_HZ" patch is much more interesting. Try
http://www.tglx.de/projects/hrtimers/ which will give you that
(amongst other things) if I'm not mistaken.