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>>         CPU_ZERO(m_cpus); >>         for (int i = 0; i < m_threads; ++i) { >>                 CPU_SET(i, m_cpus); >>                 CPU_CLR(i, w_cpus); >>         } >>         for (; i < CPU_SETSIZE; i++) {             << here i refers to >> the one in scope. which is 0. Hence w_cpus is set for all cpus. >>                                                       And hence workers >> end up running on all CPUs even with -W auto >>                 CPU_SET(i, w_cpus); >>         } > > Oh, you're exactly right. Fixing this up, thanks. I'll do some runs to > see if this changes things on my test boxes as well. Fixing this makes it substantially slower (5.2M RPS -> 3.8M RPS), with more time spent in select_task_rq(). I need to trace a bit to understand if the message thread CPUs are actually getting used that often for workers, or if the exclusion makes our idle CPU hunt slower somehow. -chris