Occasinnal CPU stuck on WAIT while watching live TV

majoly · September 5, 2019 at 8:34 PM

Ok my setup is a Server running Libreelec on a Pi 4 4gb. Its running tvheadend latest version. 9.1.901.444

Once in a while I am watching live tv and the image if frozen for between 5-30 seconds and after it starts playing again.

This happens mostly when watching live TV.

I installed the necessary addons to start a basic diagnostic to understand whats going on when its frozen.

When running normally, I see in my Network I/O using NMON that its transmitting fine and all my CPUS are mostly IDLE.

When it freezes, Half my CPU's are on WAIT and the Transmitted info is at 0kb/s.

I checked the logs and nothing was printed at that time.

No recording were active at that time and Timeshift is active.

Any idea on what to check next?

Thanks

**Iridium** · September 7, 2019 at 5:49 PM Official Post

The "Blue" lines show that the system is waiting on I/O. You need to look at what is writing to your disk and speed of your storage device.

majoly · September 12, 2019 at 3:23 PM

My usb WIFI dongle was hooked up to my powered usb hub.

I connected the dongle to a usb3 port instead.

Problem did not reappear.

Thanks!