High softirq on vCPU0 of OpenStack instances/VNFs using SRIOV interfaces

Solution In Progress - Updated -


  • High %Soft observed in vCPU0 of OpenStack instances/VNFs using SRIOV interfaces.
  • There are 2 VNFs in a compute node (one in NUMA0 and the other in NUMA1). High %soft is seen in vCPU0 of instances running in NUMA0.
  • VNFs are hitting close to 100% softirq on certain CPUs


  • Red Hat OpenStack Platform 10
  • Compute kernel : kernel-3.10.0-693.17.1.el7 ( RHEL7.4 based )
  • Intel Corporation Ethernet Controller XL710 for 40GbE QSFP+ ( SRIOV nic using i40e driver )

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