On 09-01-19 15:13:29, Dave Holland wrote:
Hello,
I've just started investigating Cinder volume encryption using Queens (RHOSP13) with a Ceph/RBD backend and the performance overhead is... surprising. Some naive bonnie++ numbers, comparing a plain vs encrypted volume:
plain: write 1400MB/s, read 390MB/s encrypted: write 81MB/s, read 83MB/s
The encryption was configured with:
openstack volume type create --encryption-provider nova.volume.encryptors.luks.LuksEncryptor --encryption-cipher aes-xts-plain64 --encryption-key-size 256 --encryption-control-location front-end LuksEncryptor-Template-256
Does anyone have a similar setup, and can share their performance figures, or give me an idea of what percentage performance impact I should expect? Alternatively: is AES256 overkill, or, where should I start looking for a misconfiguration or bottleneck?
What's the underlying version of QEMU being used here? FWIW I can't recall seeing any performance issues when working on and verifying this downstream with QEMU 2.10. Cheers, -- Lee Yarwood A5D1 9385 88CB 7E5F BE64 6618 BCA6 6E33 F672 2D76