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Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box

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From: Gabriel C <nix.or.die@...>
To: Linux Kernel Mailing List <linux-kernel@...>
Cc: Gabriel C <crazy@...>, Thomas Gleixner <tglx@...>
Subject: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box
Date: Saturday, February 23, 2008 - 8:31 pm

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
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Messages in current thread:
Clocksource tsc is always unstable with 2.6.25-* kernels and..., Gabriel C, (Sat Feb 23, 8:31 pm)
Re: Clocksource tsc is always unstable with 2.6.25-* kernels..., Andrew Morton, (Mon Feb 25, 4:14 pm)