Thanks to Calomel.org for these tips. I was having network performance issues and my throughput more than doubled now!
# Default is fine for most networks. You may want to increase to 4MB if the # upload bandwidth is greater the 30Mbit. For 10GE hosts set to at least 16MB # as well as to increase the TCP window size to 65535 and window scale to 9. # For 10GE hosts with RTT over 100ms you will need to set a buffer of 150MB and # a wscale of 12. Default of "2097152 = 2*1024*1024" is fine for 1Gbit, FIOS # or slower. # network: 1 Gbit maxsockbuf: 2MB wsize: 6 2^6*65KB = 4MB (default) # network: 1 Gbit maxsockbuf: 4MB wsize: 7 2^7*65KB = 8MB (FIOS 150/65) # network: 10 Gbit maxsockbuf: 16MB wsize: 9 2^9*65KB = 32MB # network: 40 Gbit maxsockbuf: 150MB wsize: 12 2^12*65KB = 260MB # network: 100 Gbit maxsockbuf: 600MB wsize: 14 2^14*65KB = 1064MB kern.ipc.maxsockbuf=4194304 # (default 2097152) # set auto tuning maximums to the same value as the kern.ipc.maxsockbuf above. # Use at least 16MB for 10GE hosts with RTT of less then 100ms. For 10GE hosts # with RTT of greater then 100ms set buf_max to 150MB. The default of # "2097152" is fine for most networks. net.inet.tcp.sendbuf_max=4194304 # (default 2097152) net.inet.tcp.recvbuf_max=4194304 # (default 2097152)