Hi Jonathan, On Mar 21, 2021, Jonathan Schwender wrote: > > On 2/22/21 5:20 PM, Ahmed S. Darwish wrote: > > > > Do you also have any numbers showing different results > > with/without "--mainaffinity"? > > Sorry for the delay. I do have some numbers now, and there is a > benefit to using this option if CPU isolation + CAT are > used. Otherwise it's not really visible. > Thanks a lot for the results. Since I'm doing some CAT-related stuff on RT tasks vs. GPU workloads, I'm curious, how much was the benefit of CAT ON/OFF? In your benchmarks you show that the combination of --mainaffinity, CPU isolation, and CAT, improves worst case latency by 2 micro seconds. If you keep everything as-is, but disable only CAT, how much change happens in the results? Also, how many classes of service (CLOS) your CPU has? How was the cache bitmask divided vis-a-vis the available CLOSes? And did you assign isolated CPUs to one CLOS, and non-isolated CPUs to a different CLOS? Or was the division more granular? Kind regards, -- Ahmed S. Darwish Linutronix GmbH
