@Stevo
Thanx, but the strange part is that on my PegII its enough with 4096.
Are you using Mac mini with MLDonkey or Pegasos?
On my PegII its ok with MBUF_CONF MAXMEM=4096 and "max_opened_connections = 156" in MLDonkey downloads.ini, but on my Mac mini i must lower this to max_opened_connections = 50 or else i will run out of buffers.
This is strange and indicates that maybe there is some difference between sungem_eth.device and mv6436x_eth.device.
I have tried the MBUF_CONF MAXMEM=8192 and it helps with mbufs problem but not with the mysterious system freeze, and i have tried changed the loop_delay variable but no luck:(