From CPU field, I see 6 cores(2 of Nvidia Denver and 4 of ARM cortex A57). The documentation of Tegrastats utility does not specify the order of cores in CPU [1%@345,off,off,1%@345,0%@345,1%@345].
Also, I don’t find fields related to GPU usage statistic. The tegrastats output above does not have ‘GR3D’ field.
The Denver cores are the 2nd and 3rd ones printed out - the ones that say ‘off’. The others are the A57’s.
The Denver cores are off by default to save power - you can enable them with nvpmodel utility.