Re: [ovirt-users] Ovirt with bad IO performance

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(a)redhat.com&gt;: > > > On Fri, Sep 2, 2016 at 6:11 PM, Gabriel Ozaki <gabriel.ozaki(a)kemi.com.br&gt; > 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(a)redhat.com&gt;: >> >>> On Fri, Sep 2, 2016 at 5:33 PM, Gabriel Ozaki < >>> gabriel.ozaki(a)kemi.com.br&gt; 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(a)redhat.com&gt;: >>>> >>>>> On Fri, Sep 2, 2016 at 4:44 PM, Gabriel Ozaki < >>>>> gabriel.ozaki(a)kemi.com.br&gt; 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(a)ovirt.org >>>> http://lists.ovirt.org/mailman/listinfo/users >>>> >>>> >>> >> >