Comment 2 for bug 1861685

copying the conversation from IRC
<cgoncalves> chkumar|rover, hey. so the failure was because Nova took too long to boot a VM. it is not an Octavia issue per se but impact its tests
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<cgoncalves> chkumar|rover, my suggestion is to set libvirt type=kvm, cpu_mode=host-passthrough whenever possible (OVH, vexxhost, limestone, fortnebula) and fall back to libvirt type=qemu when not (rackspace)
<cgoncalves> devstack does this today and there is a patch to further improve it: https://review.opendev.org/#/c/703324/
<cgoncalves> a follow-up patch in octavia side is https://review.opendev.org/#/c/702921/
<cgoncalves> more context in the commit message
<chkumar|rover> cgoncalves, great, I will take a look ont hat
<cgoncalves> chkumar|rover, these two patches are for performance improvements. we'd still need to check what happened in Nova that made the VM not boot up in like +20 minutes