Hi Yaniv

This results is averange in sysbench, my machine for example gets 1.3905Mb/sec, i don't know how this test really works and i will search about it

So i try to make a bonnie++ test ( reference  http://support.commgate.net/index.php?/Knowledgebase/Article/View/212 ):

Xenserver speeds:

Write speed: 91076 KB/sec

ReWrite speed: 57885 KB/sec

Read speed: 215457 KB/sec (Strange, too high)

Num of Blocks: 632.4

Ovirt Speeds:

Write speed: 111597 KB/sec (22% more then xenserver)
ReWrite speed: 73402 KB/sec (26% more then xenserver)
Read speed:  121537 KB/sec (44% less then xenserver)
Num of Blocks: 537.2 ( 15% less then xenserver)

result: a draw?

And DD test ( reference: https://romanrm.net/dd-benchmark ):
[root@xenserver teste]# echo 2 > /proc/sys/vm/drop_caches  && sync
[root@xenserver teste]# dd bs=1M count=256 if=/dev/zero of=test conv=fdatasync

256+0 registros de entrada
256+0 registros de saída
268435456 bytes (268 MB) copiados, 1,40111 s, 192 MB/s (Again, too high)

[root@ovirt teste]# echo 2 > /proc/sys/vm/drop_caches  && sync
[root@ovirt teste]# dd bs=1M count=256 if=/dev/zero of=test conv=fdatasync
256+0 registros de entrada
256+0 registros de saída
268435456 bytes (268 MB) copiados, 2,31288 s, 116 MB/s (Really fair, the host result is 124 MB/s)

HDparm (FAIL on xenserver)
[root@xenserver teste]# hdparm -Tt /dev/xvda1

/dev/xvda1:
 Timing cached reads:   25724 MB in  2.00 seconds = 12882.77 MB/sec
 Timing buffered disk reads: 2984 MB in  3.00 seconds = 994.43 MB/sec ( 8 times the expect value, something is very wrong)

[root@ovirt teste]# hdparm -Tt /dev/vda1

/dev/vda1:
 Timing cached reads:   25042 MB in  2.00 seconds = 12540.21 MB/sec
 Timing buffered disk reads: 306 MB in  3.01 seconds = 101.66 MB/sec(ok result)

There is something strange in xenserver affecting the results, probably the best choice is close the thread and  start the studies about benchmarks

Thanks

2016-09-05 12:01 GMT-03:00 Yaniv Kaul <ykaul@redhat.com>:

On Mon, Sep 5, 2016 at 1:45 PM, Gabriel Ozaki <gabriel.ozaki@kemi.com.br> wrote:

Hi Yaniv and Sandro

The disk is in the same machine then ovirt-engine

I'm looking back at your results, and something is terribly wrong there:

For example, sysbench:

Host result:            2.9843Mb/sec

Ovirt result:           1.1561Mb/sec

Xenserver result:   2.9006Mb/sec

This is slower than a USB1 disk on key performance. I don't know what to make of it, but it's completely bogus. Even plain QEMU can get better results than this.

And the 2nd benchmark:

*The novabench test:

Ovirt result:          79Mb/s

Xenserver result:  101Mb/s 

This is better, but still very slow. If I translate it to MB/s, it's ~10-12MBs - still very very slow.

If, however, this is MB/sec, then this makes sense - and is probably as much as you can get from a single spindle.

The difference between XenServer and oVirt are more likely have to do with caching than anything else. I don't know what the caching settings of XenServer - can you ensure no caching ('direct IO') is used?

Thanks

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

On Fri, Sep 2, 2016 at 6:11 PM, Gabriel Ozaki <gabriel.ozaki@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@redhat.com>:

On Fri, Sep 2, 2016 at 5:33 PM, Gabriel Ozaki <gabriel.ozaki@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@redhat.com>:

On Fri, Sep 2, 2016 at 4:44 PM, Gabriel Ozaki <gabriel.ozaki@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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