[ovirt-users] Ovirt with bad IO performance

Fri Sep 2 15:04:25 UTC 2016

On Fri, Sep 2, 2016 at 5:33 PM, Gabriel Ozaki <gabriel.ozaki at kemi.com.br>
wrote:

> 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 :(
>

100Mbps will not get you more than several MB/s. 11MB/s on a very bright
day...

>
> *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:
>

Which is not possible on the wire. Unless it's VM to VM? And the storage is
local, which means it's the bandwidth of the physical disk itself?
Y.

>
> 
> And the novabench on xenserver:
> https://novabench.com/compare.php?id=ba8dd628e4042dfc1f3d39670b164a
> b11061671
>
> *- 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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