[LAT] 2.6.29-rt1

hollunder at gmx.at hollunder at gmx.at
Fri Mar 27 15:09:46 EDT 2009


On Fri, 27 Mar 2009 10:21:28 -0700
Fernando Lopez-Lezcano <nando at ccrma.Stanford.EDU> wrote:

> On Thu, 2009-03-26 at 22:20 +0100, Robin Gareus wrote:
> > Fernando Lopez-Lezcano wrote:
> > > On Thu, 2009-03-26 at 19:52 +0100, Robin Gareus wrote:
> > > We've got a winner! 2.6.29-rt1
> > > 
> > >> Hmmmm, getting close but not yet a winner :-) 
> > > 
> > >> I've been tracking the 2.6.29 rcx series and I'm still having
> > >> some problems. 2.6.29-rt1 still does not shutdown correctly with
> > >> my kernel configuration options (you need to specify
> > >> "noreplace-smp" in the kernel startup line for shutdown to
> > >> happen - otherwise you get a problem at the very end of the halt
> > >> and the machine does not power down). 
> > 
> > This is related to your BIOS or motherboard. Do you have the same
> > problem with a vanilla 2.6.29?
> 
> I have not tested with vanilla 2.6.29 but the problem happens in
> several very different machines. I have sent feedback to
> lkml/Thomas/Ingo. 
> 
> > Since I only did reboots, I just performed a shutdown to check and
> > it powers off just fine. I don't use any boot options (only
> > "root=xx quiet ro") on this dual-core intel.
> > Why shut-down, anyway? s2ram and s2disk work fine with 2.6.29-rt1.
> > I'm very very happy (-:
> 
> Ok, I'll never turn off the machine and thus conclude there is no
> bug! :-)
> 
> > >> And I have seen it hung (hard) the whole machine where a normal
> > >> kernel would just work. I'm still trying to find a way to debug
> > >> that. 
> > 
> > I did not have those for a long time (~2years), previously I
> > experienced hard lockups when using wifi (iwl3945) and rtirq.
> > 
> > I dare say there's no way to debug that - but you should ask that on
> > rt-linux list. There's ways to tweak things
> > in /proc/sys/kernel/sched_* if this lock-up is caused by a runaway
> > process.
> > 
> > It could also be CPU overheating, but then the problem should also
> > occur with non realtime kernels as well.
> 
> Yes, no hardware problems AFAICT. 
> 
> -- Fernando

After today I'd say I do have a lot more lockups than I
had with my distro's default preempt but non-rt 2.6.28 kernel.
Also have yet to try vanilla 2.6.29.

I'd also like to have a look at your config if possible, I hear good
things about your kernels.

Best regards,
Philipp


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