Hi! > Please avoid html on mailing lists. > I'm useing the kernel 4.19.165-cip41-rt18 on the Altera > SOCkit and I encountered an problem with high TCP traffic. I notice you are using -rt kernel. Do you actually need realtime features? Can you try to reproduce the problem on 4.19.193? > Can anybody tell me what problem this message triggers? > > The check_preemption_disabled function is called when > smp_processor_id() is used. This function should be called with > preemtion disabled, but I think migrate_enable will allways enable > preemption ... I believe you got your analysis mostly right, I'd have to study the code some more to see what is going on. Best regards, Pavel -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany