Dumb question: how can you tell if cudnn is working?

[Jiangcat8301]

I've been using kohya_ss for a while to train LoRA, and thanks for the great tool!

Now I've just realized that I can speed up training by installing cudnn with the 3070 mobile I have. I failed installing to the old kohya_ss installation, and re-installed the entire thing. The new installer seems worked, and the information seems correct when I started it.

However, I've found the training speed didn't improve. In fact, it dropped from 1.2it/s to approx. 1s/it.

So I uninstalled the Cuda 12 and the cudnn 8900 from Nvidia site, and installed the old Cuda 11.8 and the cudnn file from kohya_ss git. Still the same. In fact, comparing with the old installation without cudnn, I don't see any difference other than performance DECREASING.

What did I do wrong? Any hint? :(