Some comments:



More precisely - swapout. With 100 the kernel swaps out anything but it doesn't erase it from memory and uses it if it is still in memory. The value 100 guarantee your a minimal time for your application load or swap in, for exam - in a middle of your video somebody calls you and kernel starts downloading phone application immediately.

As disadvantage, 100 forces a flash channel I/O high usage which decreases a performance of downloading because it services swapout each time. It also decreases battery time life because kernel does a lot of unnecessary work.

echo "0" > /proc/sys/vm/page-cluster

The value "0" provides you a wider I/O channel to download application from flash because kernel uses small blocks for swapping and can put an application load request faster. In over case it may increase your swapout time and wear eMMC much faster.

It forces a huge time delay (up to 10min) between file system writes. Usually it is OK for N900 but if you have some regular system halts, unexpected reboots etc then you are in danger of losing directory data --> loosing your user files (even old and unchanged) and forcing system problems too.

Actually, it is not good things because "laptop_mode" was designed for disks - it tries to group multiple writes in short time instead of spreading it, so, it is a good for disks spin down. But it has no sense for flash-based systems like N900 and introduces a serious danger of losing old files.