linux-kernel - Re: A few questions and issues with dynticks, NOHZ and powertop

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Message-ID: <20100403235326.GA23445@core.coreip.homeip.net>
Date:	Sat, 3 Apr 2010 16:53:26 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Dominik Brodowski <linux@...inikbrodowski.net>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: A few questions and issues with dynticks, NOHZ and powertop

Hi Dominik,

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...

-- 
Dmitry
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