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