TUNING

Linux:

For Raspberry Pi:

/boot/cmdline.txt:
  smsc95xx.turbo_mode=N"

/etc/sysctl.conf:

  vm.min_free_kbytes = 16384

/etc/limits.conf:
    krmx              soft    nofile         12288
    krmx              hard    nofile         24576

Make sure you have loaded pam_limits.so under login file:
   # Sets up user limits according to /etc/security/limits.conf
   # (Replaces the use of /etc/limits in old login)
   session    required   pam_limits.so
   

FreeBSD:

Apply these settings under loader.conf:
    net.inet.tcp.syncache.hashsize=4096
    net.inet.tcp.syncache.bucketlimit=100
    kern.maxfiles=204800
    kern.maxfilesperproc=200000
    net.inet.tcp.fast_finwait2_recycle=1
    net.inet.tcp.maxtcptw=409