Re: Question on RCU_BOOST option

Koehrer Mathias (ETAS/ESS2)
2013-03-27T07:50:41Z

Hi Paul,

>
> Perhaps you might want to have a look at this thread, about RCU stalls
> and a possible common root cause for some of them.
>
> http://marc.info/?l=linux-rt-users&m=136258510132233&w=2

Thanks for the information. However the application is intended to run with 100% CPU (real time) load on one core.
That's why the CPU core is isolated for. They are reserved for this application.
However to keep a system stable, the RCU must still run on this very core.
The one option is to raise the prioriy of ksoftirq (which contains the RCU stuff (if I know right...)) or I was playing with the RCU_BOOST feature which I expected to have the same effect.
However, the RCU_BOOST feature is not clear to me as I still saw the kernel messages about RCU stalls that I did not want to see anymore...

Regards

Mathias