Ubuntu 16.04 LTS high value for iowait

[Spencer Skinner]

Hi guys

Having a little bit of an issue with my Ubuntu server VM, its showing about 50% of my CPU usage as iowait which is really odd as my disk usage stats are basiclly 0 most of the time. I've used iotop and netdata to verify this. I am connected via SMB to the freenas server from within the VM and i have docker running on it, all the docker configs are contained in the SMB share so I dont know if thats causing it. Any ideas what this is and how to fix it.

Thanks
Spencer

 

[Ericloewe]

What kind of processor do you have? If you have few cores, there's going to be a ton of context switching going on in that scenario, which is never good for latency. Also applies if your physical resources are oversubscribed.

 

[Spencer Skinner]

What kind of processor do you have? If you have few cores, there's going to be a ton of context switching going on in that scenario, which is never good for latency. Also applies if your physical resources are oversubscribed.

So I've managed to fix the issue, I think it was down to a couple of issues, first was having all my configs mapped to a network drive over SMB, and the main issue was a DB error that i was having with my Radarr container, I've moved back to CouchPotato and now its working like a dream again. Might be a bug in the current image for Radarr

 

[Ericloewe]

If you can narrow it down, file a bug report and post the issue number here. Might be a while before it's looked at, but at least it won't be lost.