MTU settings freezes app

StefanoMutti

Hi all, i have been using 2 x Oak-d pro w poe together with 2 x Oak-d pro poe.

Everything is attached at the same Gigabite Poe switch which supports jumbo frames.

In my app i retrieve the colorCamera stream and the depths stream at 720p,15fps.

Normally it shows some lag, and I wanted to increase the mtu to try to reduce it.

When I set 9000 MTU using :

auto device_config = dai::BoardConfig();

device_config.network.mtu = 1500;

device_config.network.xlinkTcpNoDelay = true;

pipeline_->setBoardConfig(device_config);

the cameras crash and the thread monitor loses pings to the camera and stops the application.

What am I doing wrong ?

Thanks

jakaskerl

Hi @StefanoMutti
My guess is that fragmentation occurs since some part of the network doesn't support jumbo frames. Did you check the PC NIC actually supports MTU 9000?

Check the frame length using something like WireShark to make sure the packets are using 9000 mtu.

Thanks,
Jaka

StefanoMutti

Thanks for the reply, i will try to check.