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Thanks for your reply.

The workload is a client server model where both the VMs are running on different hosts. Yes it involves network as they are on different hosts but its impact is negligible. The networking agent used is “neutron-openvswitch-agent” on the compute node.

I will have a look in the differences in the data plane.
From: gustavo panizzo (gfa) [mailto:gfa at zumbi.com.ar]
Sent: Montag, 29. Juni 2015 13:39
To: Narayanan, Krishnaprasad; 'openstack at lists.openstack.org'
Subject: Re: [Openstack] MySQL IO performance

does your test use the network? in B what neutron agent do you use for networking?

openstack and libvirt are, at different level, control plane. you should look at the differences in the data plane


On June 29, 2015 7:19:45 PM GMT+08:00, "Narayanan, Krishnaprasad" <narayana at uni-mainz.de<mailto:narayana at uni-mainz.de>> wrote:
Hello all,


I ran tests under the following settings to measure the IO performance of MySQL database. I used Sysbench as the client workload generator. I found that the performance of MySQL (both resource utilization and application) has degraded by more than 50% after switching from setting a) to setting b).


Setting a): Controller & Compute node OS - Ubuntu 12.04, cloud software: OpenStack Havana, networking: nova-network, Hypervisor: KVM, Libvirt version: 1.1.1, QEMU version: 1.5.0, Host disk write cache: enabled, Guest disk cache: none and host OS scheduler: CFQ.
Setting b): Controller & Compute node OS - Ubuntu 14.04, cloud software: OpenStack Icehouse, networking: Neutron, Hypervisor: KVM, Libvirt version: 1.2.2, QEMU version: 2.0.0, Host disk write cache: enabled, Guest disk cache: none and host OS scheduler: CFQ.


May I know has anybody performed such tests and if yes, can you please share details on the IO performance of VMs and the application?


I don’t know whether is the right question to ask in this forum. Can somebody share information at a high level about the improvements made in Libvirt (from version 1.1.1 to 1.2.2) for handling IO requests?


Regards,
Krishnaprasad

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