Poor virtio-net performance and "bad gso: type: 1, size:" logged in RHEL 9.5

Solution Verified - Updated -

Issue

  • Since upgrading to RHEL 9.5, virtio-net network throughput performance is poor, and the following message is constantly logged into the kernel log and systemd journal and messages file:
kernel: eth0: bad gso: type: 1, size: 1368
kernel: eth0: bad gso: type: 1, size: 1368
kernel: eth0: bad gso: type: 1, size: 1368

Environment

  • Red Hat Enterprise Linux 9.5
    • Any RHEL 9.5 kernel-5.14.0-503.el9 series earlier than kernel-5.14.0-503.19.1.el9_5
  • KVM based virtualization (including Nutanix AHV)
  • virtio-net paravirtualized network adapter

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