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SubjectRe: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box
On Sun, 24 Feb 2008 01:31:21 +0100 Gabriel C <nix.or.die@googlemail.com> wrote:

> 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.
>
>

I suppose we should consider this a regression. If only because acpi_pm is
slower. But mainly because (afaik) this change was not intentional.


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