If I have a laptop, and I want to install an Ubuntu 11.04 on it, but disk performance would be an important thing, then how could I test the real differences between:  - not using encryption - using luks/aes 128bit - using luks/aes 256bitSo I would Install Ubuntu 3 times, I just not know how to do perf. test (good).What programs/methods could be good for such io performance tests? (or it affects the CPU too? - software encryption! my cpu doesn't has aes-ni)e.g.: I would install a minimal ubuntu iso, with no gui+run tests in single user mode
How to test the difference between using disk encryption or not?
linux;ubuntu;performance;io
Use a spare partition and a disk benchmark utility like bonnie++ to get a general feel for which systems take performance hits in what areas. You could also do a couple of identical installs in VirtualBox. Three machines with otherwise identical setups should take about 15 minutes of our time to setup with Ubuntu and by running them one at a time you should get a pretty level field to test between performance of your favorite apps, at least on a relative scale without implementing it system wide.