From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robin Holt Date: Wed, 05 Mar 2008 21:19:16 +0000 Subject: Re: Interval timer Message-Id: <20080305211916.GC2013@sgi.com> List-Id: References: <20080305094128.GA30069@cse.unsw.EDU.AU> In-Reply-To: <20080305094128.GA30069@cse.unsw.EDU.AU> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org On Wed, Mar 05, 2008 at 09:22:32PM +1100, Matthew Chapman wrote: > On Wed, Mar 05, 2008 at 03:53:52AM -0600, Robin Holt wrote: > > On Wed, Mar 05, 2008 at 08:41:28PM +1100, Matthew Chapman wrote: > > > Is there any interval timer on HP zx1 platforms, other than the > > > CPU-based ITC/ITM? > > > > How fine grained do you need? How much jitter are you willing to > > tolerate? How much multiplexing are we talking about? > > I don't need any strong guarantees other than the fact that an > interrupt arrives 'sometime in the next millisecond' after > programming the timer - ideally the timeouts I want are of the > order of 10 microseconds (+/- an order of magnitude), but large > jitter is fine. How about setting HZ to 1024 and using regular add_timer() timers? Thanks, Robin