With dual Quadro cards on Linux I get less than half normal NVDEC performance when I have SLI Mosaic enabled. However, I need SLI Mosaic and full performance for my application.
This occurs with multiple distros and with both RTX or prior generation cards.
You can test with the NvDecodeGL sample from the video SDK with vsync off.
I opened a bug a couple weeks ago but it is painfully slow to deal with support so far.
Has anyone else seen this?