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    SubjectRe: A few questions and issues with dynticks, NOHZ and powertop
    On Sun, Apr 04, 2010 at 12:35:15PM +0200, Dominik Brodowski wrote:
    > 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?
    >

    Do not see the point - the touchpad does not generate interrupts while
    you are not touching it and while you are touching it the machine is not
    going to sleep. The only reason I see for lowering the rate is if your
    keyboard contrioller can not handle it (some Toshibas couldn't).

    > I guess obtaining all 6 bytes at once is not really possible?

    No. i8042 is byte-oriented.

    > 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...
    >
    > Best,
    > Dominik
    >
    >
    > PS: Dmitry, got something small for you in return:

    Thanks, will apply.
    >
    >
    > [PATCH] i8042: spelling fix
    >
    > Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
    >
    > 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);

    --
    Dmitry


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