[cinder] volume encryption performance impact

Dave Holland dh3 at sanger.ac.uk
Fri Jan 11 14:32:10 UTC 2019

Thanks Lee, Arne, Thomas for replying.

On Thu, Jan 10, 2019 at 01:56:05PM +0000, Lee Yarwood wrote:
> What's the underlying version of QEMU being used here?

It's qemu-kvm-rhev-2.10.0-21.el7_5.4.x86_64

> FWIW I can't recall seeing any performance issues when working on and
> verifying this downstream with QEMU 2.10.

I had wondered about https://bugzilla.redhat.com/1500334 (LUKS driver
buffer size) which fits the symptoms, but the fix apparently went in to
qemu-kvm-rhev-2.10.0-11.el7 so shouldn't be affecting us.

I have a case open with RH Support now and I am keeping my fingers

We will be redeploying this system again shortly with the latest
Queens/RHOSP13 package versions, so should end up with
qemu-kvm-rhev-2.12.0-18.el7_6.1.x86_64 and I will re-test then.

** Dave Holland ** Systems Support -- Informatics Systems Group **
** 01223 496923 **    Wellcome Sanger Institute, Hinxton, UK    **

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