On Tue, 19 Sep 2006, Josu Onandia wrote: > Syed Amer Gilani wrote: > >> We have a MPC5200B(ppc) Board from Phytec, running with a 2.6 Linux >> Kernel. For Documentation purposes and testings how patches to the >> Kernel affects real time capabilities we want to measure the Interrupt >> Latency. >> I only found tools for other arches or patches for far to old kernels. >> Does somebody know a way for a 2.6 kernel on ppc? I already thought of >> generating a signal on an Output of the Board and measure it with a >> Oscilloscope but i don't find that method satisfying. >> >> Thank you in advance, >> Syed Amer Gilani >> _______________________________________________ >> Linuxppc-embedded mailing list >> Linuxppc-embedded@ozlabs.org >> https://ozlabs.org/mailman/listinfo/linuxppc-embedded >> >> > Hi. I'm sorry for my own latency, but I've been very busy. > > I'm measuring interrup latency in an MPC5200B, too, but with Linux 2.4. > > With this processor you can use the TB registers to measure a lapse of time. > > I use a GPT timer to generate a periodic interrupt. From the interrupt > routine I read the TBL and compare it with the expected value. > > I do this using RTAI, because I need real-time response to interrupts, > but I suppose that with little effort you can port it to standard Linux. > > If you want more details, or my actual source code, email me. > > Josu Onandia > >
What are your results under the normal kernel and under RTAI? Have anyone tried with -rt kernels? What are the results? I work for a company using MPC5200 with VxWorks. It could be fun to compare numbers... Esben _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
