> > > > > > > > > - powerpc32 updates for 2.6.30. Mainly to merge the once > > > > > > > experimental > > > > > > > bits that prevent most alignment faults from triggering a > > > > > > > secondary mode > > > > > > > switch. Andreas told me this works like a charm on 83xx, and I > > > > > > > did not > > > > > > > see any issue on 52xx, 85xx or 86xx either. > > > > > > > > > > > > > > > > > > > Can I get a version of that patch for testing? Is it in your git > > > > > > repository? > > > > > > > > > > I just pushed this commit to my remote tree (ipipe-2.6.30-powerpc > > > > > branch); it should appear in a few hours once mirrored (cron job). > > > > > > > > > > > > > I finally had a chance to test the ipipe-2.6.30-powerpc version > > > > from the git repository. Unfortunately, I noticed that our application > > > > dies after some time and that this behaviour is related to that > > > > alignment patch (if I take it out everything runs fine for > 2 days). > > > > > > > > Currently I'm investigating the reasons for that crash. It has > > > > something to do with floating point registers not being restored > > > > properly. Our alignment exceptions are mainly triggered by accesses > > > > to unaligned floating point data. > > > > > > Does it work any better with this patch in? > > > > I applied that patch but unfortunately our application still dies. I > > included > > an application with with you (hopefully) can reproduce the problem > > which we are seeing. Our system is a MPC8360 with 2.6.30, ipipe 2.7, > > xenomai 2.4.9.1. > > > > Here are the steps: > > > > 1) apply ipipe with alignment patch, recompile kernel > > 2) comile test1.c (attached) with: > > gcc -Wall -O2 `xeno-config --xeno-cflags` \ > > `xeno-config --xeno-ldflags` \ > > -l native -l rtdk -o test1 test1.c > > 3) Start test1 in one shell > > 4) Open a second shell and start 'switchbench' > > > > Just when 'switchbench' is running, I get the following > > output from my test application: > > ... > > Missmatch: 0xfff8000082064000 > > Missmatch: 0xfff8000082064000 > > Missmatch: 0xfff8000082064000 > > Missmatch: 0xfff8000082064000 > > ... > > There is a serious issue going on with this patch, because this > optimization depends on the ability of Xenomai to properly handle > non-linux, non-RT FPU usage in kernel space, which is not guaranteed so > far for powerpc (x86 is ok regarding this, though). > > So I'm just reverting this patch, in order to get back to a correct > behavior asap. This will require more thoughts later, when 2.5.0 is out. > Sorry for the delay. >
No worries Philippe... that's just one of a number of pending issues :p Thanks again for your help, Andreas _______________________________________________ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
