On Thu, Aug 6, 2020 at 3:54 PM Fabrício de Novaes Kucinskis < fabricio.kucins...@inpe.br> wrote:
> Hello all, I hope everyone on the list is health and safe. > > > > I’m studying the update of a SPARC project, currently based on RTEMS 4.11, > to RTEMS 5. > > > > After installing RTEMS 5, the first thing I did was compile and run, on > SIS, a set of example applications. > > > > When calling sparc-rtems5-sis, I noticed that the loaded application run > fast as hell, as SIS was just calling one instruction after the other, with > no timing concerns – different from what I saw on older versions. > > > > I’ve tried to set the frequency with the “-freq” parameter, but this makes > no difference. I also checked the RTEMS SPARC BSP sources, and the > CLOCK_SPEED definition inside the trap table is still set to 10, as ever. > > > > Can anyone say what is different between the previous and current SIS > versions, and how can I make the applications run with a reasonable timing? > AFAIK sis is cycle accurate for the instructions inside its simulated world. But the erc32 is VERY slow compared to the host processor and simulated code runs incredibly fast. 1 second of erc32 CPU time takes much less time to simulate. There is a perf command in sis to get the view of the simulated CPU time. I've cc'ed Jiri so he can add anything. > > > Thanks in advance and best regards, > > > > Fabrício. > _______________________________________________ > users mailing list > users@rtems.org > http://lists.rtems.org/mailman/listinfo/users
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