[ovirt-users] Ovirt with bad IO performance

Hi i am trying Ovirt 4.0 and i am getting some strange results when comparing with Xenserver **The host machine* Intel Core i5-4440 3.10GHz running at 3093 MHz 8 Gb of RAM (1x8) 500 Gb of Disk (seagate st500dm002 7200rpm) CentOS 7 (netinstall for the most updated and stable packages) **How i am testing:* I choose two benchmark tools, sysbench(epel-repo on centos) and novabench(for windows guest, https://novabench.com ), then i make a clean install of xenserver and create two guests(CentOS and Windows 7 SP1) **The Guest specs* 2 cores 4 Gb of RAM 60 Gb of disk (using virtIO in a NFS storage) Important note: only the testing guest are up on benchmark and i have installed the drivers in guest **The Sysbench disk test(creates 10Gb of data and do the bench):* # sysbench --test=fileio --file-total-size=10G prepare # sysbench --test=fileio --file-total-size=10G --file-test-mode=rndrw --init-rng=on --max-time=300 --max-requests=0 run Host result: 2.9843Mb/sec Ovirt result: 1.1561Mb/sec Xenserver result: 2.9006Mb/sec **The novabench test:* Ovirt result: 79Mb/s Xenserver result: 101Mb/s I do other tests, like cpu, memory and etc, ovirt wins with a small advantage(less then 1%) Adicional info: i use this command to install ovirt repo yum install http://resources.ovirt.org/pub/yum-repo/ovirt-release40.rpm i follow this steps on installation: http://jensd.be/550/linux/install-ovirt-on-centos-7