RE: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ required) [2.6.18-rc4-mm1]



-----Original Message-----
From: Andreas Mohr [mailto:andi@xxxxxxxxxxxxxxxxxxxxxxx]
Sent: Tuesday, November 14, 2006 9:31 AM
To: Pallipadi, Venkatesh
Cc: Len Brown; Ingo Molnar; Andreas Mohr; Thomas Gleixner;
linux-kernel@xxxxxxxxxxxxxxx; Van De Ven, Arjan
Subject: Re: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ
required) [2.6.18-rc4-mm1]

Hi,

On Tue, Nov 14, 2006 at 09:21:02AM -0800, Pallipadi, Venkatesh wrote:
I belive that Venki has looked at some of the HPET
enumeration issues,
and maybe he has some suggestions. Is there an example system
on-hand where we know Windows works and Linux does not?


There are two things that can be happening when OS does not
see HPET in
ACPI.
- BIOS did enable HPET in chipset and did not communicate it to OS.
- BIOS did nothing to enable HPET in chipset.

I'm sure you've already seen
http://semthex.freeflux.net/blog/archive/2006/10/21/hpet-to-be-
or-not-to-be.html
... or not?

Hmmm.. I hadn't seen this before..


Hmm, hopefully it's easy to research where to enable HPET
(if there is one at all!) on an el-cheapo VIA chipset...

Many thanks for your patch! (even though currently Intel-only)

Yes. This should be easy to do for any chipset. It should be documented
somewhere in the chipset documentation. Atleast it is documented on ICH
specification :).

Thanks,
Venki
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