Hi @jlficken 

Thanks for posting in our business forum.

jlficken wrote

jlficken wrote

  @Virgo 

 

I figured out what causes the CPU usage to go to 88-90%.

If I have 1 x SFP+ MMF transceiver installed the CPU sits at 0-1%.

 

If I have 2 x SFP+ MMF transceivers installed the CPU sits at 73-76%.

 

If I have 3 x SFP+ (or more) transceivers installed the CPU sits at 88-90%.

 

My other TL-SX3016F arrived today and I tested it in both units with different transceivers (all Mellanox MFM1T02A-SR) and it happens with both switches.

 

I did also try some UBNT transceivers and they show the same symptom...with a twist.  If I just have them installed but not in use then the utilization stays at 0-1%, however, if I move the fiber cable from Port 1 to Port 2 or Port 3 (UBNT #1 and #2) then the CPU usage goes to 73-76%.  I then move the fiber cable back to Port 1 and CPU usage goes back down to 0-1%.

 

I'm now more confused than ever.

This is expected to be normal. Since this was brought up on the forum by someone else again, here's the explanation

When the module is plugged in but at idle(no fiber is connected to it), the CPU usage would keep a high level. It is normal due to the chipset design.

If you don't use the SFP port, you can unplug the module from the switch to avoid high CPU usage. When the fiber and module are used at the same time on the switch, the CPU usage would fall back to a normal level.