Pandaboard - fix smsc95xx 1-1.1:1.0: eth0: kevent 2 may have been dropped

1. add smsc95xx.turbo_mode=N in /boot/boot.script

2.  /etc/sysctl.conf
    - vm.min_free_kbytes = 16384 32768
    - vm.vfs_cache_pressure = 200  300

3.  update systcl

    - sudo sysctl -p