(originally from https://web.archive.org/web/20220521093228/http://ajcsystems.com/blog/blog/2013/10/02/mythtv-high-cpu-usage-solved/)

I’ve been dealing with a very strange problem with my MythTV HTPC for a while now. Occasionally, for no good reason that I could see, both the frontend and backend processes would spike to 100% CPU utilization and hang out there until they were restarted. This caused the fans to spin up, which was annoying.

I had some time today to investigate this problem, and it turns out (at least so far) to be related to the UPnP feature. Read on for more about how I fixed it.

Read more…