On Friday, 13 August, 2010 3:35pm, "Gilles Chanteperdrix" <[email protected]> said:
> [email protected] wrote: >> >> I wonder if this is to do with graphics? I have set "NoAccel" in the >> driver section of Xorg.conf (I am using fbdev). I also notice that >> latencies go massive (e.g. 4200uS) the first time I run glxgears. >> "glxinfo" reports "Direct rendering: no". > > This is bad news. It could come either from the fact that the Xorg > driver shuts hardware interrupts off (there is nothing xenomai can do > about that), or it could be an SMI issue. What about using the driver > for the real graphic card you have ? Probably intel card? Do you observe > any big latencies if you stress the system with anything else than X? > >> Power management options (ACPUI, APM): Disable ACPI (Advanced >> Configuration and Power Interface) Support --> Processor Disable CPU >> Frequency Scaling Disable CPU idle PM support Disable Power Managment >> Support > > Disabling ACPI is a bad idea. As repeated many times, only > ACPI_PROCESSOR should be disabled, not ACPI. > Thanks for your helpful responses. I'm not working on this project again until next week, but on Friday I was able to o Recompile the kernel with ACPI enabled o Boot with the 'SMI handler' BIOS option set to disabled.... according to the help text this option should be disabled if 'an RTOS is installed' - I presume this means that SMIs are completely disabled and therefore SMIs cannot be the source of the problem (very convenient BIOS option... now I begin to appreciate the expense of this board!) o Changed xorg to use the intel video driver After doing this I still have problems with latencies and X, but did not have a chance to stress the system with non-graphics tasks. I am thinking that when I get back to it next week I will compile the kernel a few times and also try writing a large file a number of times to the disk as Philippe suggested. Hopefully this will not cause any problems and I can then more confidently attribute the high latency to the graphics system. I will also attempt to install the I-pipe tracer as suggested. I'll update when (if!?) I get that far. Thanks Edward _______________________________________________ Xenomai-help mailing list [email protected] https://mail.gna.org/listinfo/xenomai-help
