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Date: Tue, 27 Mar 2007 17:16:54 +0200
From: John <linux.kernel@free.fr>
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To: John <linux.kernel@free.fr>
CC: linux-kernel@vger.kernel.org, tglx@timesys.com, mingo@elte.hu,
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Subject: Re: 2.6.20.3-rt8 clock_nanosleep() sleeps 10 ms
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John wrote:

> It seems the CPU was not switched to high-resolution mode?
> 
> # dmesg | grep resolution
> /* NOTHING */
> 
> Do I need to enable ACPI?

ACPI seems mandatory for high-resolution mode?

I added...

CONFIG_ACPI=y
CONFIG_ACPI_EC=y
CONFIG_ACPI_POWER=y
CONFIG_ACPI_SYSTEM=y
CONFIG_X86_PM_TIMER=y

# dmesg | grep resolution
Switched to high resolution mode on CPU 0

Ingo, Thomas, do you have time to explain why ACPI is needed?

Regards.