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</o:shapelayout></xml><![endif]--></head><body lang=PT-BR link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Thanks for the response, Joel! Hope you’re fine.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>It’s been a while since I've used SIS paying attention to its timing. I'm trying it now to make some activities possible at home office, because I’m not allowed to bring lab equipment home :(.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>I've recovered some virtual machines we have with previous versions of RTEMS (and hence, SIS), and noticed that:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'> * SIS 2.7.5 for RTEMS 4.10 had its timing "correct", or else, one simulated second is near one second;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'> * SIS 2.8 for RTEMS 4.11 runs the same application super-fast, as does the current SIS 2.21 for RTEMS 5.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>So, it seems that something has changed between versions 2.7.5 and 2.8. As I've stated before, set the "freq" parameter seems to have no effect.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Maybe Jiri - long time no write! - can say if there's a way to get the same "old 2.7.5" timing behavior on the current version?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Thanks again and best regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Fabrício.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><b>De:</b> Joel Sherrill [mailto:joel@rtems.org] <br><b>Enviada em:</b> sexta-feira, 7 de agosto de 2020 11:31<br><b>Para:</b> Fabrício de Novaes Kucinskis <fabricio.kucinskis@inpe.br>; Jiri Gaisler <jiri@gaisler.se><br><b>Cc:</b> RTEMS Users <rtems-users@rtems.org><br><b>Assunto:</b> Re: Question about SIS for RTEMS 5 and timing<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Thu, Aug 6, 2020 at 3:54 PM Fabrício de Novaes Kucinskis <<a href="mailto:fabricio.kucinskis@inpe.br">fabricio.kucinskis@inpe.br</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Hello all, I hope everyone on the list is health and safe.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>I’m studying the update of a SPARC project, currently based on RTEMS 4.11, to RTEMS 5.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>After installing RTEMS 5, the first thing I did was compile and run, on SIS, a set of example applications.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>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.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>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.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>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?</span><o:p></o:p></p></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>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.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>There is a perf command in sis to get the view of the simulated CPU time.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I've cc'ed Jiri so he can add anything.<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Thanks in advance and best regards,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Fabrício.</span><o:p></o:p></p></div></div><p class=MsoNormal>_______________________________________________<br>users mailing list<br><a href="mailto:users@rtems.org" target="_blank">users@rtems.org</a><br><a href="http://lists.rtems.org/mailman/listinfo/users" target="_blank">http://lists.rtems.org/mailman/listinfo/users</a><o:p></o:p></p></blockquote></div></div></div></body></html>