On 11/10/2017 11:14 AM, Ananyev, Konstantin wrote: > Agree with Adrian here - the patch doesn't fix the problem in any case,
I would agree with you if it were possible to assume one can fully isolate a CPU on Linux... but it is not... This: https://lwn.net/Articles/659490/ is still an open issue, and the reason why it is an open issue is the kernel threads that need to run on every CPU, mainly when using the PREEMPT_RT, which turns almost everything on threads. > while introducing an unnecessary slowdown in testpmd iofwd mode. > Please think up some other approach. The other approach is to increase the priority of all other threads that run on the isolate CPU. But that is not a good idea at all, as the other threads might preempt the busy-loop thread at the worst possible moment. Using the knowledge of the thread about when it is the best time to give a chance for other threads to run would be a smarter decision. -- Daniel
