mysql> select sys.format_bytes(@@read_buffer_size) read_buffer_size, sys.format_bytes(@@max_allowed_packet) max_allowed_packet, sys.format_bytes(@@net_buffer_length) net_buffer_length;
+------------------+--------------------+-------------------+
| read_buffer_size | max_allowed_packet | net_buffer_length |
+------------------+--------------------+-------------------+
| 128.00 KiB       | 4.00 MiB           | 16.00 KiB         |
+------------------+--------------------+-------------------+
1 row in set (0.00 sec)