Re: amd iommu: rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 8 jiffies s: 113 root: 0x1/.

[Paul E. McKenney]

On Thu, Dec 04, 2025 at 03:45:05PM +0100, Borislav Petkov wrote:
> On Wed, Dec 03, 2025 at 09:16:37AM -0800, Paul E. McKenney wrote:
> > Or to some value that works for you.  But if you are not looking to be
> > an expedited RCU CPU stall-warning pioneer, yes, setting it to zero is
> > a good approach.
> > 
> > If you would like to be a more sane pioneer, setting it to (say) 11000
> > (or 11 seconds) could be appropriate.  But what fun is sanity?  ;-)
> 
> Oh, I have a lot of excitement even without RCU experiments. :-P

;-) ;-) ;-)

> But if you need me to try things, lemme know.
> 
> For now I've simply reset the values as to what defconfig sets them to:
> 
> CONFIG_RCU_CPU_STALL_TIMEOUT=21
> CONFIG_RCU_EXP_CPU_STALL_TIMEOUT=0

Sounds good, and thank you!

							Thanx, Paul

> Thx.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette