Extra Timer Interrup

[Rob Y]

This worked on my laptop top. It has the ICH4 chipset.
I've tried a few of the patches posted on the Gentoo forums. One which
supposedly included the force HPET patch for 2.6.21 but it didn't work on my
system. This is the only one that has gotten HPET so far. It is also getting
increased residency averages.

On 6/6/07, Peter Ganzhorn <peter.ganzhorn at googlemail.com> wrote:
>
> You may be glad to be wrong, today I managed to enable HPET on my ICH4
> chipset and it should be possible to get it running with ICH3 chipsets -
> AFAICT they do have hidden HPET functionalities.
> Just grab a 2.6.22-rc4 [1] kernel, patch it with 2.6.22-rc4-hrt2 [2] and
> there you go :)
>
> This output is from my ICH4-based machine:
>
> # cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> hpet acpi_pm pit jiffies tsc
>
> # grep hpet /proc/timer_list
> Clock Event Device: hpet
> set_next_event: hpet_legacy_next_event
> set_mode:       hpet_legacy_set_mode
>
> I really like this stuff, my CPU goes into C3 for up to 80ms...
>
> Peter
>
> [1] http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.21.tar.bz2 ;
> http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6.22-rc4.bz2
> [2]
>
> http://www.tglx.de/projects/hrtimers/2.6.22-rc4/patch-2.6.22-rc4-hrt2.patch
>
>
> On Sun, 2007-05-27 at 16:29 +0200, Andre Müller wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA512
> >
> > Peter Ganzhorn wrote:
> > > Well I read that even ICH3 chipsets did support HPET, though they do
> > > have different adresses and are not recognized correctly until now.
> > > I am not an expert on that topic, but maybe there is a chance that my
> > > laptop has the feature and I may be able to use it - at least I hope
> > > so ;)
> > >
> > > Peter
> >
> > I've got an ICH4 chipset and gave it a try unsuccessfully --
> > the kernel docs say it has to be activated in the BIOS,
> > which does not have an option for it.
> > I tend to trust the IBM bios's functionality and therefore
> > concluded I drew a blank.
> >
> > I will be glad to hear I'm wrong, though :-)
> >
> > Andre
> >
> > -----BEGIN PGP SIGNATURE-----
> > Version: GnuPG v1.4.7 (GNU/Linux)
> >
> > iD8DBQFGWZXWhYOgL/M0VS0RCpxaAJ9ehqPJm5kdNiRFX2soFgZmp97VtACgm5Zp
> > zVXgQ36prC4FQmcFTP5YrY0=
> > =CMWJ
> > -----END PGP SIGNATURE-----
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