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Date:	Sun, 4 Apr 2010 12:47:08 +0200
From:	Dominik Brodowski <>
To:	Dmitry Torokhov <>,
	Adam Belay <>, Len Brown <>
Cc:, Thomas Gleixner <>,
	Ingo Molnar <>,
	Peter Zijlstra <>,
	Alan Stern <>,
	Arjan van de Ven <>
Subject: Re: A few questions and issues with dynticks, NOHZ and powertop


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?

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