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I've read a lot about how fast TrueCrypt 7.0 is with it's support for AES hardware acceleration and multi-core/multi-thread support. Will dmcrypt/LUKS offer the same performance enhancing features on a full disk encryption setup on Ubuntu 11.10?

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Yes!

dmcrypt/LUKS does benefit from Intel AES hardware acceleration.

See this article for some benchmarks showing the advantages of AES-NI hardware acceleration.

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