OK, so after digging into NNPACK - requirements state avx2 and l3 cache are required.
one of my systems does not support avx2(Intel® Xeon® CPU E5-2690 v2 @ 3.00GHz) and the other does not have L3(Intel® Xeon Phi™ CPU 7250 @ 1.40GHz)
There’s nothing to be done, wish that this warning could be silenced.