USG FLEX 100H - CPU usage 20% in idle

szn

Hi,

Is this expected behavior that CPU utilisation is constantly around 20% for device that just sitting on the table - no devices behined, just connection to the internet? This is seen in device dashboard.

Simon

Zyxel_Melen

Hi @szn,

This is normal. The firewall runs many feature daemons by default, so the CPU utilization will not be 0%.

kruess

Not really what the endusers would expect from an idle device.

USG/ATP's with current load usually do not more than spike above 10-15% and having them really idle they are somewhere below 5% CPU usage.

Combine these high idle usage patterns (our 100H was more around 30-35% on idle!) with the various reports of really slow or maxing out H models (even the bigger 200 & 700 H's!) and do your math…. ☠️

PeterUK

Or maybe the CPU is so fast they put load on it that slows it down instead of under clocking it?

szn

Hi, I've checked

show diagnostics cpu all

and 40% utilisation on each core seems not to be normal. I've never seen this on any idle device. Is there something more to be checked?

Zyxel_Melen

Hi @kruess & @szn,

This is because USG FLEX H collects and statistics the traffic/process/CPU usage date in the background, which is different from the USG FLEX/ATP series, which disables those by default.

In addition, cpu_core_list 1 & 2 are for management only. It won't affect data traffic.