Zeroing large structures (i.e. size > KB) is quite costly (from a CPU point of view): we can safely avoid doing that for a couple of big structures. Standard and Valgrind tests have been diverging quite a lot: it is time to re-sync them. Use the same script and enable Valgrind via an enviroment variable: NDPI_TESTS_VALGRIND=1 ./tests/do.sh