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    SubjectRe: PS/2 mouse latency was Re: [linux-audio-dev] Re: [DATAPOINT] kernels and latencies
    Andi Kleen wrote:
    >
    > The PS/2 mouse interface has an incestuous relation to the keyboard
    > controller; they use the same registers. Keyboard controller is writen
    > to regularly in the keyboard interrupt when you press a key. Both
    > have to be serialized.

    Hi, Andi.

    Writing to the k/b is a simple outb() and yes, the statefulness of the
    host<->mouse-or-kb protocol presumably requires the higher level
    serialisation.

    But my question was: how often are aux_write_dev() and aux_write_ack()
    actually called?

    From my reading, it's only when:

    - The system is booted
    - /dev/psaux is opened
    - /dev/psaux is written to

    If these are sufficiently rare events, we can shrug and move on, no?

    -
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