i did this
echo 30 > /proc/sys/vm/swappiness
sync; echo 3 > /proc/sys/vm/drop_caches
echo 0 > /proc/sys/vm/page-cluster
echo 1 > /proc/sys/vm/laptop_mode
echo 1 > /proc/sys/vm/oom_kill_allocating_task
echo 0 > /proc/sys/vm/dirty_expire_centisecs
echo 0 > /proc/sys/vm/dirty_writeback_centisecs
echo 60 > /proc/sys/vm/dirty_background_ratio
echo 95 > /proc/sys/vm/dirty_ratio
echo 0 > /proc/sys/net/ipv4/tcp_timestamps
echo 1 > /proc/sys/net/ipv4/tcp_no_metrics_save

how to rollback those actions to be in default state.. ??
thanks in advance