Hi Mathieu Thanks for your reply.
> How are the cores isolated on your system (exact kernel command line > options or commands issued) ? There are various degree of fine-tuning > to prevent disturbance from the tick (nohz full), scheduling, and > irqs that can be done explicitly. So depending on your specific > configuration, you may be missing isolation options that would > prevent the softirq from running on your isolated cpus. Our kernel parameters are: ro skew_tick=1 rcu_nocb_poll rcu_nocbs=4-31 nohz=on nohz_full=4-31 kthread_cpus=0-3 irqaffinity=0-3 isolcpus=managed_irq,domain,4-31 intel_pstate=passive nosoftlockup tsc=nowatchdog intel_iommu=on iommu=pt default_hugepagesz=1G hugepagesz=1G hugepages=4 vfio_pci.enable_sriov=1 vfio_pci.disable_idle_d3=1 (the affected thread runs on core 4). Best regards David
