Comment # 13 on bug 1214845 from James Fehlig

(In reply to Michal Koutný from comment #12)
> (In reply to James Fehlig from comment #11)
> > I can only say there are penalties as per the comment in
> > /usr/lib/systemd/system.conf.d/__20-defaults-SUSE.conf. Perhaps Michal can
> > shed some light.
> 
> Universal answer in [1].
> As for memory controller -- it's workload and nr_cpus
> (contention/parallelism) dependent (as always). A targeted microbenchmarks
> saw below 10% drop. I believe in real workloads it will be diluted and
> negligible unless you want to squeeze every last cycle and byte (memcgs also
> need memory for themselves) of the machine.
> Partitioning memory into (accounting) cgroups affects reclaim, that may
> affect interference between jobs on the machine (which would be again
> workload dependent but it generally makes sense using memcgs between
> containers).
> 
> [1]
> https://documentation.suse.com/sles/15-SP5/html/SLES-all/cha-tuning-cgroups.
> html#sec-tuning-cgroups-accounting

Thanks Michal for your always insightful comments :-).

I'm going to close this bug now as worksforme since there were no actual fixes,
only configuration changes.