From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <478286F5.4090708@domain.hid> Date: Mon, 07 Jan 2008 21:09:25 +0100 From: Wolfgang Grandegger MIME-Version: 1.0 References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-help] Xenomai latency tests on MPC8xx List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: fabien Cc: xenomai@xenomai.org fabien wrote: > Here, there is some xenomai tests on a MPC855T, could you comment > these results please ? > Are they correct ? > > # cat cpuinfo > processor : 0 > cpu : 8xx > clock : 50MHz > bus clock : 50MHz > revision : 0.0 (pvr 0050 0000) > bogomips : 48.38 > > The kernel is a 2.6.23-6 (ppc branch) from DENX git repository, > Xenomai 2.4.0, and adeo-ipipe patch : > adeos-ipipe-2.6.23-ppc-1.6-00.patch. > > I'm new in realtime system and xenomai so i have also some questions : > First, what's the purpose of the cyclic and switchbench test ? Cyclictest is a POSIX application measuring user space task scheduling latencies. See also http://rt.wiki.kernel.org/index.php/Cyclictest. > How could i interpret the results of switchtest ? > And finaly, it's seem there is something wrong with irqloop test, but what ? irqloop is not applicable for your hardware as it does not have a parallel port or a 16550-compatible serial interface. Please check http://www.rts.uni-hannover.de/xenomai/lxr/source/doc/txt/irqbench.txt. FYI, I'm currently extending irqbench to work with GPIO port pins, especially to measure latencies for PowerPC embedded boards. Wolfgang.