How do I increase the txqueuelen on a vnet or macvtap interface?

Solution Verified - Updated -

Issue

  • How do I increase the transmit queue length on a vnet interface?
  • Is it possible to set txqueuelen on vnetX devices automatically
  • How to increase KVM hypervisor device transmit queue?
  • How can the vnet device txqueuelen be increased to persist across reboots?
  • High network interface errors on macvtapX

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • KVM virtualization
  • VM networking with bridges and vnet tuntap devices or macvtap devices

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