Stumbling across a 5% performance increase in OpenStack Kolla-Ansible CI
I went on a side quest a couple of weekends ago which seems like it might have ended up being a big win. That win likely applies to other people running both OpenStack, but also other cloud orchestration systems using libvirt like oVirt, Proxmox, Shaken Fist, and so forth.
By way of back story, I have a stack of patches which I maintain on top of OpenStack’s Kolla and Kolla-Ansible. Most of those patches continue to progress the new “spice-direct” console type in OpenStack Nova, but I also occasionally find little bugs or CI regressions along the way that I want to clean up. One example of such a bug was Kolla’s failure to setup virtlogd to provide instance console log rotation, which is currently being backported to various releases. Another one is the topic of this post.