The modprobe line in the answer is missing the "options" keyword. Should be -
/etc/modprobe.d/mlnx.conf:
options mlx4_core log_num_mgm_entry_size=-1
The modprobe line in the answer is missing the "options" keyword. Should be -
/etc/modprobe.d/mlnx.conf:
options mlx4_core log_num_mgm_entry_size=-1