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How is performance impacted by whole disk encryption systems such as PGP or LUKS?

How do PGP and LUKS compare in performance?

Im working on Ubuntu 10.10

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Whole disk encryption doesn't put more load on the hard drive. The extra load comes from encrypting/decrypting the data which is done by the CPU.

In my experience, not using either of the above products, most operations didn't have a significant end user perceived performance penalty but did incur a bit more CPU load (~ %10) than the same operations without encryption.

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which encryption software have you used? any specific issues? Im contemplating changing over my multi boot laptop over to fully encrypted since I do alot of traveling –  madmaze Jan 24 '11 at 20:42
    
It was about 5 years ago so I don't recall the application's name. It was full disk encryption on the company provided laptop. I recall the initial install taking about 2 days to encrypt the entire drive in the background. After that the laptop ran just about is it did before the install with a slightly higher CPU load. –  Chris Nava Jan 24 '11 at 21:48

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