[ovirt-users] Ovirt with bad IO performance

Gabriel Ozaki gabriel.ozaki at kemi.com.br
Fri Sep 2 13:44:03 UTC 2016

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:
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