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

    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...

    as a sidenote: if we know -- like here -- that the next IRQ will be issued
    soon, in approximately 1.75 ms (well, at least on my system), might it make
    sense to make tick_nohz_get_sleep_length() smarter to know about this?

    Best,
    Dominik


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