[ovirt-users] Ovirt with bad IO performance

Mon Sep 5 10:45:47 UTC 2016

Hi Yaniv and Sandro

The disk is in the same machine then ovirt-engine

Thanks


2016-09-02 15:31 GMT-03:00 Yaniv Kaul <ykaul at redhat.com>:

>
>
> 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=no
>>>> ne,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-ae84-4e
>>>> 73-922f-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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