Re: [ovirt-users] Ovirt with bad IO performance
On Fri, Sep 2, 2016 at 4:44 PM, Gabriel Ozaki <gabriel.ozaki(a)kemi.com.br>
wrote:
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)
The nfs server is in the host?
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
- Is this 2.9GiB/s or 2.9 MiB/s?
- Are you testing using NFS in all versions?
- What is the disk format?
- How do you test io on the host?
- What kind of nic is used? (1G, 10G?)
**The novabench test:*
Ovirt result: 79Mb/s
Xenserver result: 101Mb/s
We need much more details to understand what do you test here.
- For ovirt, can you share the vm command line, available in
/var/log/libvirt/qemu/vmname.log?
- For Xenserver - detailed description of the vm and the storage
configuration?
Nir
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