Re: [Xenomai-help] Perfs and rt alarms questions.

[Jan Kiszka <jan.kiszka@domain.hid>]

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Jan Kiszka wrote:
> RAKOTOSALAMA, Nirilanto wrote:
>> Hello everybody.
>>
>> I managed to compile a stable kernel (the Scalability O(1) scheduler options seems to make my system freeze)
> 
> That's not good. What precisely did you do? Applied the .config you
> posted, just enabling CONFIG_XENO_OPT_SCALABLE_SCHED? And what test
> case, latency?

Hmm, maybe related: Philippe, I once posted you an oops under
qemu-system-x86_64 which we explained with a probably broken toolchain.

I just pulled out that config again, updated everything
(crosstools-0.43: gcc-4.1.1-glibc-2.3.6-tls + tiny patch [1], Xenomai
trunk, adeos-ipipe-2.6.19-x86_64-1.0-06) - and still got that crash on
"latency" startup. The oops still happens around [2]. Interesting is
that turning off CONFIG_XENO_OPT_SCALABLE_SCHED makes it go away.

Given that I now tested my setup with gcc4 (instead of the earlier gcc3
run), there may be some code that "confuses" compilers (or it's simply
broken). I failed to reproduce the issue on x86, and cross debugging
somehow still don't work for me, so I can't tell more.

Jan

[1]https://www.x86-64.org/pipermail/discuss/2006-November/009546.html
[2]http://www.rts.uni-hannover.de/xenomai/lxr/source/ksrc/nucleus/shadow.c?v=SVN-trunk#225



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