KVM performance

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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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