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    SubjectRe: Mouse interrupts: the death knell of a VP6
    On Wed, 10 Apr 2002, John Adams wrote:

    > On Wednesday 10 April 2002 11:23 am, Oleg Drokin wrote:
    > > Hello!
    > >
    > > On Wed, Apr 10, 2002 at 09:02:05AM -0500, Brent Cook wrote:
    > > > I have an ABIT VP6 motherboard, using the VIA Apollo chipset and 2
    > > > 700Mhz PIII's, but please don't hold that against me. The system is
    > > > running 2.4.19-pre6. I believe that I either have a system that has
    > > > trouble handling a sudden bursts of interrupts, or have found a fault
    > > > in mouse handling.
    > >
    > > Have you tried to change MPS mode to 1.1 from 1.4 (I see addres message
    > > timeouts in your log)?
    > >
    > > > I have already tried removing memory, adding memory, changing
    > > > processors, video cards. The only thing that has remained constant is
    > > > the VP6 motherboard and the hard drive.
    > >
    > > My VP6 died on me recently with some funny symptoms:
    > > it hangs in X when I start netscape and move mouse, or if I do
    > > bk clone on kernel tree, it dies with
    > > kernel BUG at /usr/src/linux-2.4.18/include/asm/smplock.h:62!
    > > BUG in various places pretty soon.
    > > (this BUG is only appears if 2 CPUs are present in motherboard).
    > > So if your troubles began only recently, you might want to try another
    > > motherboard just to be sure.
    >
    > I have a VP6 with 2 CPUs. Its has both a PS/2 mouse and a usb mouse. Its
    > been up for 90 days and handled lots of mouse interrupts. See below.
    > CPU0 CPU1
    > 0: 392228152 392338774 IO-APIC-edge timer
    > 1: 312494 312380 IO-APIC-edge keyboard
    > 2: 0 0 XT-PIC cascade
    > 3: 1 3 IO-APIC-edge serial
    > 12: 40362907 40324010 IO-APIC-edge PS/2 Mouse
    > 14: 3386577 3383180 IO-APIC-edge ide0
    > 15: 679030 672810 IO-APIC-edge ide1
    > 17: 1165246 1162993 IO-APIC-level DC395x_TRM
    > 18: 83937970 83935445 IO-APIC-level ide2, eth0
    > 19: 131956 132468 IO-APIC-level es1371, usb-uhci, usb-uhci
    > NMI: 0 0
    > LOC: 784686934 784686951
    > ERR: 191
    > MIS: 0

    Oleg's suggestion about MPS didn't work, but it was fun. Instead of dying
    instantly, a USB mouse pauses about 9 times before it finally halts. The
    device in dmesg also disconnects/reconnects 9 times before it is unable to
    assign a device number again to the mouse. PS/2 still locks the entire
    machine. Loading and unloading usb-uhci.o does reinitialize the USB mouse
    for a while, so it is fixable w/o rebooting.

    This is also interesting. You appear to not have the strange ACPI device
    at hardware interrupt 9 that I do. While the VP6 BIOS does not have the
    option to turn off ACPI, perhaps I should try one of the hacked bioses at
    abitvp6.com to turn off ACPI (maybe it is the culprit..) This is my
    current situation (right after a USB lock):

    CPU0 CPU1
    0: 260203 267484 IO-APIC-edge timer
    1: 10471 10704 IO-APIC-edge keyboard
    2: 0 0 XT-PIC cascade
    5: 29249 29198 IO-APIC-level usb-uhci, usb-uhci
    9: 0 0 IO-APIC-edge acpi
    10: 13715 13332 IO-APIC-level eth0
    14: 6255 5839 IO-APIC-edge ide0
    15: 10 3 IO-APIC-edge ide1
    NMI: 0 0
    LOC: 527647 527647
    ERR: 0
    MIS: 0

    The acpi device appears whether or not I have ACPI support in the kernel.

    - Brent

    > Its running a recent kernel. Maybe 2.4.18 is broken. Here's a uname -a
    > Linux flash 2.5.0 #16 SMP Wed Jan 9 16:48:16 EST 2002 i686 unknown
    >
    > johna

    2.5 exhibits similar behavior.

    Thanks,
    Brent

    -
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