install mysql from source

Does anybody install mysql from source and able to insert binary data into mysql? I have tested it in the source installation MySQL server in RedHat 7.2 with PHP and found that the image can only be stored and retrival from mysql using PHP when the image's size is smaller than 1K. Although, I increase the size of mysql's max_allowed_packet, net_buffer, table_cache. But when I install MySQL rpm and do nothing change to mysqld configuration, it works properly when I insert and retrival image from mysql even the image's size is larger than 500K. Anybody know the reasons? Thank you very much!