Re: is dynamic tick working?

[David Brownell <david-b@pacbell.net>]

On Sunday 14 May 2006 3:49 am, Tony Lindgren wrote:
> * David Brownell <david-b@pacbell.net> [060512 19:05]:
> > In short, enabling dyntick got me 14x as many IRQs, instead of
> > shrinking the number of IRQs.  Known bug?
> 
> Is this with touchscreen enabled? I saw something similar last week
> where SPI was generating interrupts continuously. I think Imre has a
> patch for that already available.

It was, but I don't think I've seen such a patch yet.

I had noticed that the ads7846 code grew a glitch whereby its timer
polls for position even when the "pen" isn't down.  That's oddly
similar to a glitch in omap-keyboard, where it keeps a timer active
even when no Mistral key is pressed.


> In general dyntick should work, and you should see about 4-6HZ idle
> tick rate.

Depending on drivers, it seems ... ;)

I have a patch to get rid of the OHCI root hub polling, which will
get rid of one 4Hz timer.

- Dave