linux-kernel - Re: hpet timers gone?

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Date:	Wed, 26 May 2010 12:02:36 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Udo van den Heuvel <udovdh@...all.nl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: hpet timers gone?

On Mon, 24 May 2010 12:19:47 +0200 Udo van den Heuvel wrote:

> Hello,
> 
> What has happened between 2.6.30.9 and 2.6.32.8 with regard to hpet timers?
> 
> dmesg output from 2.6.30.9 does show activity but 2.6.32.8 and beyond don't.
> Also /proc/timer_list doesn't show hpet anymore. Also on 2.6.34 no hpet
> in timer_list.
> 
> relevant .config:
> CONFIG_HPET_TIMER=y
> CONFIG_HPET_EMULATE_RTC=y
> CONFIG_HPET=y
> CONFIG_HPET_MMAP=y

Same here.

> And I have hpet=force on the kernel commandline for this VIA Epia
> LT10000 board.
> 
> Any ideas?

On x86 peecee:

$ uname -a
Linux chimera.site 2.6.34 #2 SMP Tue May 18 10:52:27 PDT 2010 x86_64 x86_64 x86_64 GNU/Linux
$ grep hpet /proc/timer_list
Clock Event Device: hpet
 set_next_event: hpet_legacy_next_event
 set_mode:       hpet_legacy_set_mode



$ dmesg | grep -i hpet
[    0.000000] ACPI: HPET 00000000cf6f3000 00038 (v01 GATEWA SYSTEM   0000017E MSFT 01000013)
[    0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
[    0.000000] hpet clockevent registered
[    0.000000] TSC: PIT calibration matches HPET. 1 loops
[    0.771604] HPET: 3 timers in total, 0 timers will be used for per-cpu timer
[    0.771604] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
[    0.771604] hpet0: 3 comparators, 64-bit 14.318180 MHz counter


What does dmesg show on your machine?

---
~Randy
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