Home Assistant causing high CPU utilization on USG?

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1

Hi all,

Not sure if anyone else has experienced this:

I’m running Home Assistant Core v109.6 on an Ubuntu 18.04 VM, within VirtualBox on a NUC running Windows 10 (that’s a mouthful…). My network is Ubiquiti Unifi based, with a USG as the main firewall/router. I’ve just noticed recently that my USG has started showing high CPU utilization whenever Home Assistant is running. My research has shown that the offending process on the USG is avahi-daemon, which I know is one of the requirements for Home Assistant.

Anyone ever seen this before? Utilization usually sits between 50-60%, but can jump up to 80-90% randomly. Once I shut off my VM, utilization drops to ~3% or so. Unfortunately, I’m not sure how long this has been the case so not sure if it was due to a USG firmware upgrade, one of the HA builds, or some update on the Ubuntu VM. Any insight would be great

2

Running into this exact issue today - did you ever solve this?

3

Not really, though I did migrate my VM off of the NUC and onto a Supermicro server. Currently running the latest version of HA (113.3) and the USG utilization went back down to under 10% (currently sitting at 4%).

Before migrating my installation, I noticed that avahi-daemon deals with multicast and once i disabled mDNS in my Unifi controller, the utilization dropped. However, mDNS is necessary if you have Chromecasts on a separate vlan, so this was not an option for me.

4

My issue started when I changed my HTPC running the VM with HA from wifi to wired LAN, haven’t been able to rectify the issue, I’ll end up rebuilding the HA VM

5

May be related to multicast repeater. See here: https://github.com/home-assistant/plugin-multicast/issues/1