Usblive

http://stevehanov.ca/blog/index.php?id=48

Tip 0: Smettere di vedere la schermata di installazione/prova

modificare in /etc/init/ubiquity.conf:

- nonintarctive=
+ nonintarctive=1

Tip 1: Stop Firefox from writing to disk

Firefox 3 has a hard-to-fix bug that causes linux to write to disk every time you visit a write page. But it doesn't just write Firefox stuff — it causes your entire system to dump all changes to disk. Unfortunately, your USB key might only have a 6 MB/s write speed, causing everything to freeze up.

1. Under the Privacy setting, uncheck "Keep my history for…"
2. Under the Advanced Tab, select Network and ensure that you use up to 0 MB of disk space for the cache.

Tip 4: Use memory instead of disk

modificare /etc/rc.local inserendo

+ swapoff -a

This tip can also lead to data loss. If you do it, you will have to always shut down your computer properly from now on, because unexpected power failures will lead to data loss.

Linux usually ensures that all changes are written to disk every few seconds. Since disk writes are so slow, you can change your system to keep things in memory longer. All changes will be written to memory, and the excruciatingly slow writes to happen in the background while you continue working. This has an instant, noticeable effect, but it can lead to data loss.

Add these lines to /etc/sysctl.conf, and reboot.

vm.swappiness = 0
vm.dirty_background_ratio = 20
vm.dirty_expire_centisecs = 0
vm.dirty_ratio = 80
vm.dirty_writeback_centisecs = 6000

The problem: using this tip means that your system stops writing changes to disk until you shut down or type "sync" at a command line. If your system loses power unexpectedly, you will get bad blocks. I did. You can limit the amount of data loss in the event of a power failure to one minute by setting vm.dirty_writeback_centisecs = 6000.

A side effect is that shutting down your computer will may take several minutes where it appears to be doing nothing. Don't cut the power until it's done, because it is busy writing all those changes to disk.

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