From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Brownell Subject: Re: is dynamic tick working? Date: Sun, 14 May 2006 09:19:08 -0700 Message-ID: <200605140919.09540.david-b@pacbell.net> References: <200605121905.13405.david-b@pacbell.net> <20060514104911.GB4715@atomide.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20060514104911.GB4715@atomide.com> Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-omap-open-source-bounces@linux.omap.com Errors-To: linux-omap-open-source-bounces@linux.omap.com To: Tony Lindgren Cc: linux-omap-open-source@linux.omap.com List-Id: linux-omap@vger.kernel.org On Sunday 14 May 2006 3:49 am, Tony Lindgren wrote: > * David Brownell [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