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    SubjectRe: [PATCH] i386: disable local apic timer via command line or dmi quirk
    Date
    On Tuesday 27 March 2007 23:28, Len Brown wrote:
    > Thomas,
    >
    > Is this failure specific to NO_HZ, and that is why the "nolapic_timer" fix is i386 only?
    > I'm running 2.6.21-rc5 an nx6325 here in 64-bit mode and I don't see the dramatic
    > boot failure described earlier in this thread.
    >
    > However, I have observed that when running on battery,
    > the LOC falls behind the irq0 timer to the tune of about
    > 2 interrupt/minute. eg. when i booted my machine, LOC was
    > behind irq0 by 50, and now about a 20 minutes later it is behind
    > irq0 by 99. However, the LOC for each processor remain at
    > a constant offset with respect to each other.
    >
    > I do not see these this drift when running on AC.

    Correction.
    I double-checked and the same drift is present between irq0
    and LOC when on AC:

    lenb@nx6325:/tmp/sut> uname -a; cat /proc/interrupts; sleep 100; cat /proc/interrupts
    Linux nx6325 2.6.21-rc5 #37 SMP Tue Mar 27 22:26:00 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
    CPU0 CPU1
    0: 1000442 0 <NULL>-edge timer
    1: 724 0 IO-APIC-edge i8042
    8: 0 0 IO-APIC-edge rtc
    12: 36299 0 IO-APIC-edge i8042
    14: 33661 0 IO-APIC-edge ide0
    16: 20676 0 IO-APIC-fasteoi libata
    19: 21 0 IO-APIC-fasteoi ehci_hcd:usb1, ohci_hcd:usb2, ohci_hcd:usb3
    20: 1 0 IO-APIC-fasteoi ohci1394
    21: 9388 0 IO-APIC-fasteoi acpi
    23: 43794 0 IO-APIC-fasteoi eth0
    NMI: 0 0
    LOC: 1000271 1000247
    ERR: 0
    CPU0 CPU1
    0: 1025442 0 <NULL>-edge timer
    1: 724 0 IO-APIC-edge i8042
    8: 0 0 IO-APIC-edge rtc
    12: 39539 0 IO-APIC-edge i8042
    14: 34506 0 IO-APIC-edge ide0
    16: 22172 0 IO-APIC-fasteoi libata
    19: 21 0 IO-APIC-fasteoi ehci_hcd:usb1, ohci_hcd:usb2, ohci_hcd:usb3
    20: 1 0 IO-APIC-fasteoi ohci1394
    21: 9630 0 IO-APIC-fasteoi acpi
    23: 44826 0 IO-APIC-fasteoi eth0
    NMI: 0 0
    LOC: 1025269 1025245
    ERR: 0
    lenb@nx6325:/tmp/sut> bc -l
    bc 1.06
    Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
    This is free software with ABSOLUTELY NO WARRANTY.
    For details type `warranty'.
    1025442-1000442
    25000
    1025269-1000271
    24998
    lenb@nx6325:/tmp/sut> cat /proc/acpi/ac_adapter/C1BD/state
    state: on-line

    -Len

    > Yes, the system exports just C1 in both cases.
    >
    > Other oddities is the IRQ name on irq0 is garbled:
    >
    > lenb@nx6325:~> uname -a; cat /proc/interrupts; sleep 100; cat /proc/interrupts
    > Linux nx6325 2.6.21-rc5 #37 SMP Tue Mar 27 22:26:00 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
    > CPU0 CPU1
    > 0: 723812 0 <NULL>-edge timer
    > 1: 716 0 IO-APIC-edge i8042
    > 8: 0 0 IO-APIC-edge rtc
    > 12: 30719 0 IO-APIC-edge i8042
    > 14: 24318 0 IO-APIC-edge ide0
    > 16: 18316 0 IO-APIC-fasteoi libata
    > 19: 21 0 IO-APIC-fasteoi ehci_hcd:usb1, ohci_hcd:usb2, ohci_hcd:usb3
    > 20: 1 0 IO-APIC-fasteoi ohci1394
    > 21: 6736 0 IO-APIC-fasteoi acpi
    > 23: 30358 0 IO-APIC-fasteoi eth0
    > NMI: 0 0
    > LOC: 723675 723651
    > ERR: 0
    > CPU0 CPU1
    > 0: 748812 0 <NULL>-edge timer
    > 1: 716 0 IO-APIC-edge i8042
    > 8: 0 0 IO-APIC-edge rtc
    > 12: 30719 0 IO-APIC-edge i8042
    > 14: 25164 0 IO-APIC-edge ide0
    > 16: 18361 0 IO-APIC-fasteoi libata
    > 19: 21 0 IO-APIC-fasteoi ehci_hcd:usb1, ohci_hcd:usb2, ohci_hcd:usb3
    > 20: 1 0 IO-APIC-fasteoi ohci1394
    > 21: 6960 0 IO-APIC-fasteoi acpi
    > 23: 31385 0 IO-APIC-fasteoi eth0
    > NMI: 0 0
    > LOC: 748673 748649
    > ERR: 0
    > lenb@nx6325:~> bc -l
    > bc 1.06
    > Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
    > This is free software with ABSOLUTELY NO WARRANTY.
    > For details type `warranty'.
    > 748812-723812
    > 25000
    > 748673-723675
    > 24998
    > 723812-723675
    > 137
    > 748812-748673
    > 139
    > lenb@nx6325:~>
    >
    > Further, in dmesg:
    > ATI board detected. Disabling timer routing over 8254.
    >
    > ..MP-BIOS bug: 8254 timer not connected to IO-APIC
    >
    > -Len
    >
    >
    >
    -
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