Re: ppp/diald networking dying under heavy IDE (or CPU?) load

From: Daniel B. (REMOVEdanielTHIS_at_fgm.com)
Date: 05/05/04

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    Date: Wed, 05 May 2004 15:15:23 -0400
To: Jens Simmoleit <simmel@anymotion.de>

    Jens Simmoleit wrote:

    > Hi Daniel :-)
    >
    >
    >>Is there a known reason why heavy IDE load (or possibly heavy CPU
    >>load in copying disk to disk) would cause network connections over
    >>ppp and diald to die?
    >>
    >
    >
    > Could it be by any chance that the NIC and the ide controller and also the
    > serial port controller are hooked up on the same IRQ?

    At least according to /proc/interrupts, the serial port doesn't seem to
    be sharing interrupts:

    # more /proc/interrupts
                CPU0 CPU1
       0: 1924074 0 XT-PIC timer
       1: 13204 0 XT-PIC keyboard
       2: 0 0 XT-PIC cascade
       3: 490726 0 XT-PIC serial
       5: 0 0 XT-PIC eth0
       8: 3 0 XT-PIC rtc
      10: 0 0 XT-PIC CMI8738-MC6
      11: 53222 0 XT-PIC ide2, ide3
      12: 125384 0 XT-PIC PS/2 Mouse
      14: 3696354 0 XT-PIC ide0
      15: 121555 0 XT-PIC ide1
    NMI: 0 0
    LOC: 1922900 1924053
    ERR: 3287
    MIS: 0
    #

    I was thinking that it was only disks on my ide0 and ide1 controllers
    (ports?) (for which I had disabled DMA to avoid horrible file system
    corruption) that were involved with network problems, but I need to see
    if things differ for disks on my ide2 and ide3 controllers (a Promise
    Ultra100/TX2 card).

    I am getting occasional "kernel: PPP: VJ decompression error" in my
    logs. Might that result from dropped characters from a buffer
    overrun (e.g., if the CPU is too busy doing PIO disk I/O to service
    the serial port frequently enough)?

    Daniel 

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