linux-kernel - Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO

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Message-ID: <47C0BAD9.7030908@googlemail.com>
Date:	Sun, 24 Feb 2008 01:31:21 +0100
From:	Gabriel C <nix.or.die@...glemail.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	Gabriel C <crazy@...galware.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y
 on my box

Hi,

I noticed tsc is always marked unstable on my box with 2.6.25* , 2.6.24 is fine.

...

[    0.825760] ACPI: PCI Interrupt 0000:03:0e.0[A] -> GSI 22 (level, low) -> IRQ 22
[    0.805755] Switched to high resolution mode on CPU 1
[    0.794244] Switched to high resolution mode on CPU 2
[    0.766968] Switched to high resolution mode on CPU 3
[    1.083944] Switched to high resolution mode on CPU 0
[   15.388792] Clocksource tsc unstable (delta = 9373391604 ns)
[   15.714648] Time: acpi_pm clocksource has been installed.

...

Booting nohz=off fixes that.

Another strange thing is when I try to boot that kernel with clocksource=acpi_pm it just hangs.

config is attached.

Please let me know if you need more infos / want me to try patches or anything else.


Regards,

Gabriel

View attachment "config" of type "text/plain" (58333 bytes)