[ovirt-users] Ovirt with bad IO performance

Fri Sep 2 18:31:46 UTC 2016

On Fri, Sep 2, 2016 at 6:11 PM, Gabriel Ozaki <gabriel.ozaki at kemi.com.br>
wrote:

> Hi Yaniv
>
> Sorry guys, i don't explain well on my first mail, i notice a bad IO
> performance on *disk* benchmarks, the network are working really fine
>

But where is the disk? If it's across the network, then network is involved
and is certainly a bottleneck.
Y.

>
>
>
>
>
>
>
> 2016-09-02 12:04 GMT-03:00 Yaniv Kaul <ykaul at redhat.com>:
>
>> 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=ba8dd628e4042dfc1f3d396
>>> 70b164ab11061671
>>>
>>> *- 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-0414-0
>>> 5F8-D906-710700080009,uuid=21872e4b-7699-4502-b1ef-2c058eff1c3c
>>> -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/va
>>> r/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/52
>>> ee9f87-9d38-48ec-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-virti
>>> o-disk0,id=virtio-disk0,bootindex=1 -chardev
>>> socket,id=charchannel0,path=/var/lib/libvirt/qemu/channels/2
>>> 1872e4b-7699-4502-b1ef-2c058eff1c3c.com.redhat.rhevm.vdsm,server,nowait
>>> -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel
>>> 0,id=channel0,name=com.redhat.rhevm.vdsm -chardev
>>> socket,id=charchannel1,path=/var/lib/libvirt/qemu/channels/2
>>> 1872e4b-7699-4502-b1ef-2c058eff1c3c.org.qemu.guest_agent.0,server,nowait
>>> -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel
>>> 1,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
>>>>
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>>
>>
>
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