linux-kernel - Re: 2.6.20.3-rt8 clock_nanosleep() sleeps 10 ms

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Message-ID: <46093566.4040902@free.fr>
Date:	Tue, 27 Mar 2007 17:16:54 +0200
From:	John <linux.kernel@...e.fr>
To:	John <linux.kernel@...e.fr>
CC:	linux-kernel@...r.kernel.org, tglx@...esys.com, mingo@...e.hu,
	johnstul@...ibm.com, akpm@...l.org, linux.kernel@...e.fr
Subject: Re: 2.6.20.3-rt8 clock_nanosleep() sleeps 10 ms

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.
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