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    SubjectRe: serial flow control appears broken
    Paul Fulghum wrote:

    > Lee Howard wrote:
    >
    >> And in repeat tests it is quite evident that IDE disk activity is,
    >> indeed, at least part of the problem. As IDE disk activity increases
    >> an increased amount of data coming in on the serial port goes missing.
    >
    >
    > Lee, you mentioned 2.2.x kernels did not exhibit this problem.
    >
    > Was this on the same hardware you are currently testing?


    Yes it was... except for the hard drive. I have different installs of
    different operating systems on different hard drives. I change the hard
    drive when switching between 2.2.5 and 2.6.5.

    > Which 2.2.x version were you using?


    The default 2.2.5 kernel that comes with RedHat 6.0.

    > Was the 2.2.x serial driver also identifying the UART as a 16550A?


    Yes it does.

    > Can you get /proc/interrupts output
    > from both the current setup and the 2.2.x setup?


    Current (2.6.5):

    CPU0
    0: 14660696 XT-PIC timer
    1: 8 XT-PIC i8042
    2: 0 XT-PIC cascade
    3: 1240314 XT-PIC serial
    4: 778901 XT-PIC serial
    8: 1 XT-PIC rtc
    10: 111647 XT-PIC eth0
    14: 221202 XT-PIC ide0
    15: 34 XT-PIC ide1
    NMI: 0
    ERR: 5

    (2.2.5):

    CPU0
    0: 5908 XT-PIC timer
    1: 88 XT-PIC i8042
    2: 0 XT-PIC cascade
    8: 2 XT-PIC rtc
    10: 38 XT-PIC Intel EtherExpress Pro 10/100 Ethernet
    13: 1 XT-PIC fpu
    14: 36637 XT-PIC ide0
    15: 4 XT-PIC ide1
    NMI: 0

    Thanks,

    Lee.
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