[ovirt-users] Ovirt with bad IO performance

Gabriel Ozaki gabriel.ozaki at kemi.com.br
Fri Sep 2 14:33:36 UTC 2016

Hi Nir, thanks for the answer

*The nfs server is in the host?*
Yes, i choose NFS to use as storage on ovirt host

*- Is this 2.9GiB/s or 2.9 MiB/s?*
Is MiB/s, i put the full test on paste bin
centos guest on ovirt:

centos guest on xenserver:

how the test works:

*- Are you testing using NFS in all versions?*
i am using the v3 version

*- What is the disk format?*
partion size format
/    20Gb xfs
swap 2 Gb xfs
/dados rest of disk xfs   (note, this is the partition where i save the
ISOs,exports and VM disks)

*- How do you test io on the host?*
I do a clean install of centos and do the test before i install the ovirt
the test:

*- What kind of nic is used? (1G, 10G?)*
Is only a 100mbps :(

*We need much more details to understand what do you test here.*
I have problems to upload the benchmark test on orvirt to novabench site,
so here is the screenshot(i make a mistake on the last email i get the
wrong value), is 86 Mb/s:

And the novabench on xenserver:

*- For Xenserver - detailed description of the vm and the storage
The host is the same(i install xenserver, do the tests before i install
centos), the VM i use the same configuration of ovirt, 2 cores, 4 Gb of ram
and 60 Gb disk(in the default xenserver SR)

*- For ovirt, can you share the vm command line, available in
2016-09-01 12:50:28.268+0000: starting up libvirt version: 1.2.17, package:
13.el7_2.5 (CentOS BuildSystem <http://bugs.centos.org>,
2016-06-23-14:23:27, worker1.bsys.centos.org), qemu version: 2.3.0
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -name vmcentos -S -machine
pc-i440fx-rhel7.2.0,accel=kvm,usb=off -cpu Haswell-noTSX -m
size=4194304k,slots=16,maxmem=4294967296k -realtime mlock=off -smp
2,maxcpus=16,sockets=16,cores=1,threads=1 -numa
node,nodeid=0,cpus=0-1,mem=4096 -uuid 21872e4b-7699-4502-b1ef-2c058eff1c3c
-smbios type=1,manufacturer=oVirt,product=oVirt
-no-user-config -nodefaults -chardev
-mon chardev=charmonitor,id=monitor,mode=control -rtc
base=2016-09-01T09:50:28,driftfix=slew -global
kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -boot strict=on
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device
virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x3 -device
virtio-serial-pci,id=virtio-serial0,max_ports=16,bus=pci.0,addr=0x4 -drive
ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=2 -drive
-device usb-tablet,id=input0 -vnc,password -k pt-br -device
VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x2 -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on
2016-09-01T12:50:28.307173Z qemu-kvm: warning: CPU(s) not present in any
NUMA nodes: 2 3 4 5 6 7 8 9 10 11 12 13 14 15
2016-09-01T12:50:28.307371Z qemu-kvm: warning: All CPU(s) up to maxcpus
should be described in NUMA config
qemu: terminating on signal 15 from pid 1
2016-09-01 19:13:47.899+0000: shutting down


2016-09-02 11:05 GMT-03:00 Nir Soffer <nsoffer at redhat.com>:

> On Fri, Sep 2, 2016 at 4:44 PM, Gabriel Ozaki <gabriel.ozaki at 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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