Hallo,
as I want to switch from XEN to KVM I've made some performance tests
to see if KVM is as peformant as XEN. But tests with a VMU that receives
a streamed video, adds a small logo to the video and streams it to a
client
have shown that XEN performs much betten than KVM.
In XEN the vlc (videolan client used to receive, process and send the
video) process
within the vmu has a cpuload of 33,8 % whereas in KVM
the vlc process has a cpuload of 99.9 %.
I'am not sure why, does anybody now some settings to improve
the KVM performance?
Thank you.
Regards, Stefanie.
Used hardware and settings:
In the tests I've used the same host hardware for XEN and KVM:
- Dual Core AMD 2.2 GHz, 8 GB RAM
- Tested OSes for KVM Host: Fedora 10, 2.6.27.5-117.fc10.x86_64 with kvm
version 10.fc10 version 74
also tested in january: compiled kernel with
kvm-83
- KVM Guest settings: OS: Fedora 9 2.6.25-14.fc9.x86_64 (i386 also
tested)
RAM: 256 MB (same for XEN vmu)
CPU: 1 Core with 2,2 GHz (same for XEN vmu)
tested nic models: rtl8139, e1000, virtio
Tested Scenario: VMU receives a streamed video , adds a logo (watermark)
to the video stream and then streams it to a client
Results:
XEN:
Host cpu load (virt-manager): 23%
VMU cpu load (virt-manager): 18 %
VLC process within VMU (top): 33,8%
KVM:
no virt-manager cpu load as I started the vmu with the kvm command
Host cpu load : 52%
qemu-kvm process (top) 77-100%
VLC process within vmu (top): 80 - 99,9%
KVM command to start vmu
/usr/bin/qemu-kvm -boot c -hda /images/vmu01.raw -m 256 -net
nic,vlan=0,macaddr=aa:bb:cc:dd:ee:10,model=virtio -net
tap,ifname=tap0,vlan=0,script=/etc/kvm/qemu-ifup,downscript=/etc/kvm/qem
u-ifdown -vnc 127.0.0.1:1 -k de --daemonize
________________________________
Alcatel-Lucent Deutschland AG
Bell Labs Germany
Service Infrastructure, ZFZ-SI
Stefanie Braun
Phone: +49.711.821-34865
Fax: +49.711.821-32453
Postal address:
Alcatel-Lucent Deutschland AG
Lorenzstrasse 10
D-70435 STUTTGART
Mail: stefanie.braun@xxxxxxxxxxxxxxxxx
Alcatel-Lucent Deutschland AG
Sitz der Gesellschaft: Stuttgart - Amtsgericht Stuttgart HRB 4026
Vorsitzender des Aufsichtsrats: Michael Oppenhoff Vorstand: Alf Henryk
Wulf (Vors.), Dr. Rainer Fechner
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