[ovirt-users] Ovirt with bad IO performance

Fri Sep 2 10:33:36 EDT 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:
http://pastebin.com/d48qfvuf

centos guest on xenserver:
http://pastebin.com/gqN3du29

how the test works:
https://www.howtoforge.com/how-to-benchmark-your-system-cpu-file-io-mysql-with-sysbench

*- 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:
http://pastebin.com/7RKU7778

*- 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:
https://novabench.com/compare.php?id=ba8dd628e4042dfc1f3d39670b164ab11061671

*- For Xenserver - detailed description of the vm and the storage
configuration?*
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
/var/log/libvirt/qemu/vmname.**log?*
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
(qemu-kvm-ev-2.3.0-31.el7.16.1)
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
Node,version=7-2.1511.el7.centos.2.10,serial=03AA02FC-0414-05F8-D906-710700080009,uuid=21872e4b-7699-4502-b1ef-2c058eff1c3c
-no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-vmcentos/monitor.sock,server,nowait
-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
file=/rhev/data-center/mnt/ovirt.kemi.intranet:_dados_iso/52ee9f87-9d38-48ec-8003-193262f81994/images/11111111-1111-1111-1111-111111111111/CentOS-7-x86_64-NetInstall-1511.iso,if=none,id=drive-ide0-1-0,readonly=on,format=raw
-device
ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=2 -drive
file=/rhev/data-center/00000001-0001-0001-0001-0000000002bb/4ccdd1f3-ee79-4425-b6ed-5774643003fa/images/2ecfcf18-ae84-4e73-922f-28b9cda9e6e1/800f05bf-23f7-4c9d-8c1d-b2503592875f,if=none,id=drive-virtio-disk0,format=raw,serial=2ecfcf18-ae84-4e73-922f-28b9cda9e6e1,cache=none,werror=stop,rerror=stop,aio=threads
-device
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-chardev
socket,id=charchannel0,path=/var/lib/libvirt/qemu/channels/21872e4b-7699-4502-b1ef-2c058eff1c3c.com.redhat.rhevm.vdsm,server,nowait
-device
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.rhevm.vdsm
-chardev
socket,id=charchannel1,path=/var/lib/libvirt/qemu/channels/21872e4b-7699-4502-b1ef-2c058eff1c3c.org.qemu.guest_agent.0,server,nowait
-device
virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=org.qemu.guest_agent.0
-device usb-tablet,id=input0 -vnc 192.168.0.189:0,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

Thanks

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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