Julien Heyman wrote: > Hi, > > I am currently trying to evaluate Xenomai, and my current setup is : > VIA C3 533Mhz processor, Kubuntu 6.06 Linux distribution. > I am using Xenomai-2.1.0 over a 2.6.17.4 kernel.
General advice: especially when starting new, try to pick the latest version, at least the latest from the preferred series (here 2.1.2). But 2.2 is even better. :) > When I run the latency part of the testsuite (in a console under KDE), I > get > results that I cannot understand, so I probably did something wrong > (execution trace included below). > I get reasonable values during the first seconds, then all of a sudden > latencies begin to rise, continuously, to very large values. > - I did check that DMA transfer is activated on my HD. > - I did select "Enable SMI workaround" + "Globally disable SMI" in the > Xenomai > options while configuring the kernel. > - I have disabled power management at BIOS level and disabled ACPI support > and > CPU frequency scaling during kernel configuration. > - I checked that I don't have anything called "legacy USB" in my BIOS. I do > have an "OnChip USB" option enable in the BIOS though. > > Any advice would be appreciated ! Maybe it's related to some other weird on-chip hardware. At work we run Xenomai only on a head-less VIA C3 box, i.e. without X. No problems so far. I would suggest to try stopping X and run the test from the text mode. A further tool to analyse such effects in details is the I-pipe tracer. It's an additional patch you have to apply to your kernel (see http://download.gna.org/adeos/patches/v2.6/i386/tracer). Enable this I-pipe option, rebuild your kernel, and start the latency test with -f. The test will then capture on every new worst-case delay a backtrace to /proc/ipipe/trace/frozen. You may want to play with the number of back-trace points or the verbose mode (see /proc/ipipe/trace/*) even after the capturing. Unless you find something obvious immediately, feel free to post a backtrace that includes the problematic delay period before the freeze (compress when too large). Jan
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