No AES-NI engine detected

Running master on a CPU identifying itsel (/proc/cpuinfo) as

Intel(R) Xeon(R) CPU           X5650  @ 2.67GHz

with openssl-1.0.1 (./Configure --prefix=$HOME/usr shared linux-x86_64) I had expected tor to tell me that it found an AES-NI engine. (This would've been wrong, since 1.0.1 doesn't have AES-NI as an engine, I learned later.)

This made Nick make a patch (branch openssl101_aes_ctr in his repo) which shows interesting benchmarks.

src/test/bench cell_ops, run three times on virtually unloaded machine, output from the third run:

On openssl101_aes_ctr w/ openssl-1.0.1: Inbound cells: 629.38 ns per cell. (1.24 ns per byte of payload) Outbound cells: 693.97 ns per cell. (1.36 ns per byte of payload)

On openssl101_aes_ctr w/ openssl-0.9.8k: Inbound cells: 8823.04 ns per cell. (17.33 ns per byte of payload) Outbound cells: 4816.15 ns per cell. (9.46 ns per byte of payload)

On master w/ openssl-1.0.1: Inbound cells: 13861.66 ns per cell. (27.23 ns per byte of payload) Outbound cells: 7436.42 ns per cell. (14.61 ns per byte of payload)

On master w/ openssl-0.9.8k: Inbound cells: 8863.88 ns per cell. (17.41 ns per byte of payload) Outbound cells: 5265.16 ns per cell. (10.34 ns per byte of payload)