MySQL slows down (3 replies)

hi guys...

can you help me again with my configurations?
my database server suddenly slows down after 3 months of running smoothly,

i suspect my configuration is not enough for my growing data

Database Size: 1339.50658035 MB and still growing

i got i5-650 processor, 8GB of RAM 1TB Hard drive and 32bit Linux

Here are the configurations i usually play with...

innodb_data_file_path = ibdata1:10M:autoextended
innodb_buffer_pool_size = 16M
innodb_additional_mem_pool = 20M

innodb_log_file_size = 5M
innodb_log_buffer_size = 8M

max connections = 500

when i monitor the server from navicat tool show full processlist i see "sending data" as state and its very slow and when it reaches 40 to 140 number of process

the last time it run smoothly its only averaging 20 number of process MAX
and the process finishes fast

are they right?
are they too small?
any additional configuration should i add?



Great help is appreciated.... thanks in advance...