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

This is a discussion on Re: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box - Kernel ; Gabriel C 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) -> ...

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

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

    Gabriel C 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.


    Please post your full dmesg output.
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  2. Re: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box

    On Sun, 24 Feb 2008, Robert Han**** wrote:
    > Gabriel C 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)


    Doh, this looks like the acpi_pm timer is not working at all.

    > > [ 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.


    Which confirms the above.

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

    >
    > Please post your full dmesg output.


    Yes please.

    Thanks,
    tglx
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  3. Re: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box

    Thomas Gleixner wrote:
    > On Sun, 24 Feb 2008, Robert Han**** wrote:
    >> Gabriel C 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)

    >
    > Doh, this looks like the acpi_pm timer is not working at all.
    >
    >>> [ 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.

    >
    > Which confirms the above.
    >
    >>> config is attached.
    >>>
    >>> Please let me know if you need more infos / want me to try patches or
    >>> anything else.

    >> Please post your full dmesg output.

    >
    > Yes please.


    dmesg's from 2.6.25-rc3 witch nohz={on,off} , lspci , dmidecode and the used config for this kernel can be found there :

    http://frugalware.org/~crazy/dmesg/lara/

    >
    > Thanks,
    > tglx
    >



    Regards,

    Gabriel
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  4. Re: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box

    On Mon, 25 Feb 2008, Gabriel C wrote:
    > >>> Booting nohz=off fixes that.
    > >>>
    > >>> Another strange thing is when I try to boot that kernel with
    > >>> clocksource=acpi_pm it just hangs.


    What happens if you add clocksource=acpi_pm and nohz=off to the kernel
    commandline ?

    > >> Please post your full dmesg output.

    > >
    > > Yes please.

    >
    > dmesg's from 2.6.25-rc3 witch nohz={on,off} , lspci , dmidecode and
    > the used config for this kernel can be found there :
    >
    > http://frugalware.org/~crazy/dmesg/lara/


    Hmm. Nothing really obvious.

    Thanks,
    tglx
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  5. Re: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box

    Thomas Gleixner wrote:
    > On Mon, 25 Feb 2008, Gabriel C wrote:
    >>>>> Booting nohz=off fixes that.
    >>>>>
    >>>>> Another strange thing is when I try to boot that kernel with
    >>>>> clocksource=acpi_pm it just hangs.

    >
    > What happens if you add clocksource=acpi_pm and nohz=off to the kernel
    > commandline ?
    >


    Then the kernel boots and it seems to work.

    http://frugalware.org/~crazy/dmesg/lara/dmesg2

    >>>> Please post your full dmesg output.
    >>> Yes please.

    >> dmesg's from 2.6.25-rc3 witch nohz={on,off} , lspci , dmidecode and
    >> the used config for this kernel can be found there :
    >>
    >> http://frugalware.org/~crazy/dmesg/lara/

    >
    > Hmm. Nothing really obvious.


    If you want I can build an debug kernel and boot with initcall_debug or anything else may help to find the problem,
    just let me know.

    >
    > Thanks,
    > tglx
    >


    Gabriel
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  6. Re: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box

    On Mon, 25 Feb 2008, Gabriel C wrote:
    >
    > > What happens if you add clocksource=acpi_pm and nohz=off to the kernel
    > > commandline ?

    >
    > Then the kernel boots and it seems to work.
    >
    > If you want I can build an debug kernel and boot with initcall_debug
    > or anything else may help to find the problem, just let me know.


    Sorry, this thread slipped out of my attention.

    Is this still true with 2.6.25-rc5 ?

    Thanks,

    tglx

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

    Thomas Gleixner wrote:
    > On Mon, 25 Feb 2008, Gabriel C wrote:
    >>> What happens if you add clocksource=acpi_pm and nohz=off to the kernel
    >>> commandline ?

    >> Then the kernel boots and it seems to work.
    >>
    >> If you want I can build an debug kernel and boot with initcall_debug
    >> or anything else may help to find the problem, just let me know.

    >
    > Sorry, this thread slipped out of my attention.
    >
    > Is this still true with 2.6.25-rc5 ?


    Yes it is , I'm running 2.6.25-rc5-00232-g93d7446 and it has the same problem.

    >
    > Thanks,
    >
    > tglx
    >
    >


    Gabriel
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