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    SubjectRe: 2.5.69 Interrupt Latency
    Paul Fulghum <paulkf@microgate.com> wrote:
    >
    > In the process of eliminating kernel options to isolate
    > the problem, eliminating USB completely appears to fix it.
    >
    > One machine (server) was using usb-uhci and
    > the other (laptop) was using usb-ohci.
    >
    > So it looks like something with USB in 2.5.68-bk11

    ah, that helps.

    This code was added to wakeup_hc(). It is called from uhci_irq():

    + /* Global resume for 20ms */
    + outw(USBCMD_FGR | USBCMD_EGSM, io_addr + USBCMD);
    + wait_ms(20);

    The changelog just says "Minor patch for uhci-hcd.c"

    Can you delete the wait_ms() and see if that is our culprit?
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