Wael BACHTA wrote: > Hi, > > I use an Intel Pentium 4 processor which can be used as 2 virtual > processors when setting the SMP option during the kernel compiling (I can > see 2 processors with "cat /proc/cpuinfo").
Hyperthreading? No good idea for RT if you are after low latencies. This virtualisation of a second CPU is incomplete and can cause congestions so that you stall on low-prio work at arbitrary points in your code. I would suggest to measure the effect to be sure if it is acceptable (latency test under high non-RT load like kernel builds, with SMP vs. !SMP). > > I patched the kernel with adeos in order to install xenomai. I discovered > that : > - when completely disabling the ACPI and setting the SMP, my system boots > but I have only one processor when I look into /proc/cpuinfo > - Everything goes well when I don't disable completely the ACPI. > > I also use a PCI framegrabber. its driver is a real time one developed [If it is for common hardware, publishing it would be nice. I guess that there are others interested in such support.] > under xenomai. I noticed that this driver works fine only if the PCI_MSI > is set. Otherwise, I don't have any interrupts. > > I must use my real time driver and the 2 virtual processors. > But, when I enable the ACPI, the SMP and the PCI_MSI, I have a kernel > panic. My PC boots when I disable the ACPI but I loose 1 processor. What about ACPI on (/wo ACPI_PROCESSOR) and SMP off? > > I don't see what's wrong. Likely Adeos/I-pipe, as the amount of MSI-related bug reports also indicates. Maybe this workaround already helps you: https://mail.gna.org/public/adeos-main/2006-09/msg00032.html If not, try to catch the oops (e.g. via serial or netconsole) for further debugging. In any case, please post your findings. Jan
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