[ovirt-users] Ovirt with bad IO performance

Fri Sep 2 18:49:22 UTC 2016

Il 02/Set/2016 08:32 PM, "Yaniv Kaul" <ykaul at redhat.com> ha scritto:
>
>
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> 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.

No yaniv. It's hyperconverged setup with local storage exported over nfs v3

> Y.
>
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>> 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=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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>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>
>>>
>>
>
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