Hi Jan, I tried disabling SMP - but no success... Unfortuantely, the SMI watchdog does not work on my machine. After booting the PC, dmesg shows me the line Xenomai: NMI watchdog not available.
Is the NMI watchdog support somehow configurable or is this a real hardware issue? For patching the kernel, I used the adeos-ipipe-2.6.19-i386-1.6-02.patch which is part of Xenomai. As I do not see an easy way to get the 2.6.19.* running, I think, I will switch back to the latest 2.6.17.* kernel (2.6.17.14) which works fine. Regards Mathias > > I have an issue with the latest Xenomai (svn #1962) and rtnet (svn #1095) > versions > > using kernel 2.6.19.1. The very same application worked fine on 2.6.17.7 > (same Xenomai/rtnet). > > /Might/ be an issue of the still fresh 2.6.19 patch. You are using > latest ipipe 1.6-02? Any difference with an earlier version of the > patch? Is the IRQ routing identical for both 2.6.19 and .17? > > > My application does the following steps in user space: > > 1) I open one UDP socket to an embedded device. > > 2) The timeout of the socket is set to 5 seconds. > > 3) I send out one UDP message A via rt_dev_send() to the device. > > 4) Then I wait for the response for A in rt_dev_recv() > > 5) Directly after the return of rt_dev_recv() I send message B via > rt_dev_send() > > 6) Then I wait for the response for B in rt_dev_recv() > > Here my PC freezes. I am no longer able to access it, I have to press the > reset button on the PC. > > > > I have connected the PC and the embedded device with a hub. This allows me > to monitor the network > > traffic using a second PC. Ethereal shows me, that message B is sent to > the embedded device > > and the response of B is sent back to the PC. > > > > Whenever I place a printf() directly after the rt_dev_recv() statements to > see what happens, > > everything works fine and the PC no longer freezes. > > printf causes a mode switch and certainly some delay that may let the > system avoid the race situation above. > > > > > As mentioned above, when I use the very same application with 2.6.17.7 > (same Xenomai, rtnet version) > > everything is perfect! > > I have a Pentium 4 Dual core, SMP enabled. > > > > Any idea on this strange behaviour? > > Not directly. > > OK, this is what you could try: Switch on the Xenomai watchdogs (soft > and NMI). Check if the NMI watchdog is working: boot log messages, maybe > even a test triggering via small /proc/xenomai/nmi_maxlat (we had > problems with it already on some other user's box, so some confirmation > the NMI works is useful). Then see if you system can at least issue some > oops on lock-up. Attach a serial console to grab it. > > Beyond this test, could you also try with CONFIG_SMP switched off? > > Jan > > > -- Mathias Koehrer [EMAIL PROTECTED] Viel oder wenig? Schnell oder langsam? Unbegrenzt surfen + telefonieren ohne Zeit- und Volumenbegrenzung? DAS TOP ANGEBOT JETZT bei Arcor: günstig und schnell mit DSL - das All-Inclusive-Paket für clevere Doppel-Sparer, nur 44,85 inkl. DSL- und ISDN-Grundgebühr! http://www.arcor.de/rd/emf-dsl-2 ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ RTnet-users mailing list RTnet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rtnet-users
