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    SubjectRe: A few questions and issues with dynticks, NOHZ and powertop
    Hi Dmitry,

    On Sat, Apr 03, 2010 at 04:53:26PM -0700, Dmitry Torokhov wrote:
    > On Sun, Apr 04, 2010 at 12:33:28AM +0200, Dominik Brodowski wrote:
    > >
    > > 4) SynPS/2 touchpad:
    > > Why does moving the touchpad lead to sooo many IRQs? I can't look as fast
    > > as the mouse pointer seems to get new data:
    > > 62,5% (473,1) <interrupt> : PS/2 keyboard/mouse/touchpad
    > >
    > 80 pps @ 6 bytes/packet = 480 interrupts/sec.
    > You can try using psmouse.rate=40 to limit it to 40 pps which should
    > bring it to the rate of standard PS/2 mouse at the expense of
    > sensitivity...

    Excellent. Maybe this could be added to the Tips&Tricks section at the
    Powertop website?

    I guess obtaining all 6 bytes at once is not really possible? It
    seems a new byte only appears ~1.75 ms after the last one, at least on my
    notebook, so waiting for this is not an option...


    PS: Dmitry, got something small for you in return:

    [PATCH] i8042: spelling fix

    Signed-off-by: Dominik Brodowski <>

    diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
    index 9302ba0..f61233e 100644
    --- a/drivers/input/serio/i8042.c
    +++ b/drivers/input/serio/i8042.c
    @@ -38,7 +38,7 @@ MODULE_PARM_DESC(noaux, "Do not probe or use AUX (mouse) port.");

    static bool i8042_nomux;
    module_param_named(nomux, i8042_nomux, bool, 0);
    -MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing conrtoller is present.");
    +MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing controller is present.");

    static bool i8042_unlock;
    module_param_named(unlock, i8042_unlock, bool, 0);

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