30 Mar
2008
30 Mar
'08
11:48 a.m.
On Tuesday 18 March 2008, Arnold Krille wrote:
Am Dienstag, 18. März 2008 schrieb Fons Adriaensen:
You don't need an -rt kernel to hardlock your system with a runaway SCHED_FIFO
or SCHED_RR process. It works just as well on a vanilla kernel. To avoid this
the only thing you can do is to either
a] run a watchdog app (mine is a bit broken atm, so i cannot recommend it)
b] do not run SCHED_FIFO or SCHED_RR processes.
Using an -rt kernel has nothing to do with it.
Flo
--
Palimm Palimm!
http://tapas.affenbande.org
An -rt kernel will be more robust in those cases,
and also
gives you the tools to optimize your system by assigning
interrupt handling priorities. The result is that you can
have lower latencies.
Unfortunately this comes at a price:
During development it is way easier to lock your system when you use an rt
kernel. Because the amoc-running process with realtime-priority gets all
the processing time it wants, it can be _very_ hard to get the system to
react to keyboard/mouse or network-ssh to get it back under control...
Of course this isn't really an issue for the mere user.