Amigo,
O parametro kern.ipc.nmbclusters, por padrao, vem com o valor "0". Esse parametro é referente à memoria utilizada pelos sockets do sistema. Logo, quando a quantidade de sockets abertos aumentar, é necessário a alteraçao desse valor, conforme abaixo:
kern.ipc.nmbcluster – this parameter governs ultimate amount memory you have to allocate all sockets opened on that system. This number tells how many number of mbuf cluster should be allocated. Usually each cluster is of 2k size. For example , if you are planning to open 1000 sockets with each having 8k sending and 8k size receving buffer . In this case each socket will need 16k of memory and in total you will need 16M (16k x 1000 ) of memory to handle all 1000 connections.
sds,