On Tuesday 15 May 2007 13:41, Peter Feuerer wrote: > Hi Alessio, > > On Tue, 2007-05-15 at 13:32 +0200, Alessio Igor Bogani wrote: > > Hi Peter, > > > > On Tue, 2007-05-15 at 13:26 +0200, Peter Feuerer wrote: > > [...] > > > > > > First of all, running a realtime OS on such a machine is no good > > > > idea, as it is full of system management software that steals you the > > > > CPU. > > > > > > What do you mean by "system management software"? The only software > > > running on my gx1 hardware is my linux system with kernel 2.6.18 using > > > rt preempt patch and compiled for x86. > > > > This type of software is implemented into BIOS. > > I see. Thanks for this information, that's realy annoying! No, it makes this x86 system compatible to standard pc. Try to run any time critical software and scroll your text console screen (it must be a text console, no graphical one). You will get very nice results.... (side note: Text mode is completely emulated in SMM) > > [...] > > > > > I tried this for rt-preempt patched kernels > 2.6.18 (where acpi is > > > needed for the highres timer) but still no hard realtime capability. > > > > I'm trying 2.6.21-rt1 and it _seems_ works (not tested yet). > > The kernel itself was booting up, and running fine, but cyclictest and > my little square wave example > (http://rt.wiki.kernel.org/index.php/Squarewave-example) were not able > to achieve stable timings. Once again. On this piece of hardware there is no other useful timer as the PIT. Juergen -- Dipl.-Ing. Juergen Beisert | http://www.pengutronix.de Pengutronix - Linux Solutions for Science and Industry Handelsregister: Amtsgericht Hildesheim, HRA 2686 Vertretung Sued/Muenchen, Germany Phone: +49-5121-206917-7 | Fax: +49-5121-206917-9 - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
