Re: [ANNOUNCE] v5.9.1-rt19

[Sebastian Andrzej Siewior]

On 2020-10-27 11:25:47 [+0100], Daniel Wagner wrote:
> Well, one thing I need to figure out is how to get pi_stress working
> correctly on my machines (that is for all -rt trees, so it's nothing
> new). It consistently triggers RCU stall warnings with hackbench as
> workload. Clark told me the test only works if there are enough CPUs to
> run on. Need to look into it.

Is it running as a RT task? Do you have RCU-boosting enabled?
Otherwise it looks that if you throw enough non-RT load on the system,
RCU can not catch up which does not sound good.

Sebastian