/etc/sysctl.conf tuning

sysctl.conf

# Recycle Zombie connections 
net.inet.tcp.fast_finwait2_recycle=1 
net.inet.tcp.maxtcptw=200000 

# Increase number of files 
kern.maxfiles=65535 
kern.maxfilesperproc=16384 

# Increase page share factor per process 
vm.pmap.pv_entry_max=54272521 
vm.pmap.shpgperproc=20000 

# Increase number of connections 
vfs.vmiodirenable=1 
kern.ipc.somaxconn=3240000 
net.inet.tcp.rfc1323=1 
net.inet.tcp.delayed_ack=0 
net.inet.tcp.restrict_rst=1 
kern.ipc.maxsockbuf=2097152 
kern.ipc.shmmax=268435456 

# Host cache 
net.inet.tcp.hostcache.hashsize=4096 
net.inet.tcp.hostcache.cachelimit=131072 
net.inet.tcp.hostcache.bucketlimit=120 

# Increase number of ports 
net.inet.ip.portrange.first=2000 
net.inet.ip.portrange.last=100000 
net.inet.ip.portrange.hifirst=2000 
net.inet.ip.portrange.hilast=100000 
kern.ipc.semvmx=131068 

# Disable Ping-flood attacks 
net.inet.tcp.msl=2000 
net.inet.icmp.bmcastecho=1 
net.inet.icmp.icmplim=1 
net.inet.tcp.blackhole=2 
net.inet.udp.blackhole=1