# Tweak max read_ahead_kb
# SD cards (mmcblk) read ahead tweaks
  echo "1024" > /sys/devices/virtual/bdi/179:0/read_ahead_kb
  echo "1024" > /sys/devices/virtual/bdi/179:8/read_ahead_kb

# Onenand (stl) read ahead tweaks
  echo "64" > /sys/devices/virtual/bdi/138:9/read_ahead_kb
  echo "64" > /sys/devices/virtual/bdi/138:10/read_ahead_kb
  echo "64" > /sys/devices/virtual/bdi/138:11/read_ahead_kb