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I have a fileserver running x86_64 version of ArchLinux. The boot drive is unencrypted, all data disks use dmcrypt with aes-xts-benbi cipher, keysize 512bit (256bit effectively), I use the aes_x86_64 module.
The encrypted devices are in two LVM volume groups, specifically "data" and "backup". When copying files between these two the performance is awfully bad. A full rsync of my 1.3T storage took more than a day to complete, rsync showed 13MB/s when it finished.
The server got a Athlon64 3200+ Winchester Core (single core) running hat 2Ghz. When I copy files between the two volume groups CPU usage is almost 100%.
I don't think this behaviour is normal, the TrueCrypt benchmark on my 1.86Ghz notebook achieves speeds that are way beyond the transfer rate of any of my harddisks, and I would expect dmcrypt to be on par or faster than the TrueCrypt AES implementation.
Can anyone help?
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