Hello,
I think that I've mixed the values in my first email for this topic and
actually provided the values without network virtio enabled.
So the values for a kvm vmu with enabled virtio are indeed a little better but
not as good as Xen.
At the moment I'm still working to get the virtio disk vmu setup working as I
think it would be interesting how the performance values would improve.
All following tests have been executed using a vmu (ram 512 mb, 1 core 2,2 GHz)
and the vlc (video player, that can f.e. stream, receive, transcode videos)
VMU setup for first performance values (without network virtio)
/usr/bin/qemu-kvm -boot c -hda /images/vmu01.raw -m 512 -net
nic,vlan=0,macaddr=aa:bb:cc:dd:ee:10 -net
tap,ifname=tap0,vlan=0,script=/etc/kvm/qemu-ifup,downscript=/etc/kvm/qemu-ifdown
-net nic,vlan=1,macaddr=aa:bb:cc:dd:ee:11 -net
tap,ifname=tap1,vlan=1,script=/etc/kvm/qemu-ifup,downscript=/etc/kvm/qemu-ifdown
-vnc 127.0.0.1:2 -k de --daemonize
VMU setup for second performance values (with network virtio)
/usr/bin/qemu-kvm -boot c -hda /images/vmu01.raw -m 512 -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/qemu-ifdown
-net nic,vlan=1,macaddr=aa:bb:cc:dd:ee:11,model=virtio -net
tap,ifname=tap1,vlan=1,script=/etc/kvm/qemu-ifup,downscript=/etc/kvm/qemu-ifdown
-vnc 127.0.0.1:2 -k de --daemonize
The first column of performance values show the VMU without virtio network, the
second column with virtio network
1. Subtest: VLC reads video from local disk and streams it via udp to another pc
Host performance: 11% 11%
kvm process in host (top): 22% 22%
vlc process in vmu (top): 15% 7%
2. Subtest: Just receiving a video via udp (no displaying as no X11 is
installed on the vmu)
Host performance: 16% 10%
kvm process in host (top) : 30% 17%
vlc process in vmu (top) : 3% 3%
3. Subtest: Receiving a video via udp and saving it locally in a file
Host performance: 17% 11%
kvm process in host (top) : 38% 24%
vlc process in vmu (top) : 12% 11%
4. Subtest: Reading video locally, adding a logo to the video stream and then
saving the video locally
Host performance: 50% 50%
kvm process in host (top) : 99% 99%
vlc process in vmu (top) : 99% 99%
5. Subtest: Receiving the video from pc 1 and at the same time streaming the
received video to pc 2
Host performance: 23% 18%
kvm process in host (top) : 22% 35%
vlc process in vmu (top) : 48% 10%
6. The originial test: receiving streamed video, adding a logo and the sending
it to another pc
Host performance: 52% 50%
kvm process in host (top) : 77-99% 60-99% (for
both most time 99%)
vlc process in vmu (top) : 80-99% 50-99% (for
both most time 99%)
I've have repeated almost all tests with XEN
1. Subtest: VLC reads video from local disk and streams it via udp to another pc
Host performance (Domain-0 + vmu)(virt-manager): 4%
VMU (virt-manager) :
2%
vlc process in vmu (top) :
1%
3. Subtest: Receiving a video via udp and saving it locally in a file
Host performance (Domain-0 + vmu)(virt-manager): 7%
VMU (virt-manager) :
4%
vlc process in vmu (top) :
3%
4. Subtest: Reading video locally, adding a logo to the video stream and then
saving the video locally
Host performance (Domain-0 + vmu)(virt-manager): 3-55%
VMU (virt-manager) :
0-50%
vlc process in vmu (top) :
14 -99% varies a lot
5. Subtest: Receiving the video from pc 1 and at the same time streaming the
received video to pc 2
Host performance (Domain-0 + vmu)(virt-manager): 6%
VMU (virt-manager) :
3%
vlc process in vmu (top) :
1%
6. The originial test: receiving streamed video, adding a logo and the sending
it to another pc
Host performance (Domain-0 + vmu)(virt-manager): 23%
VMU (virt-manager) :
18%
vlc process in vmu (top) :
33,8%
-----Ursprüngliche Nachricht-----
Von: Avi Kivity [mailto:a...@redhat.com]
Gesendet: Montag, 6. April 2009 18:36
An: BRAUN, Stefanie
Betreff: Re: AW: KVM performance
BRAUN, Stefanie wrote:
> Is this a tcp test?
>
> Can you test receive and transmit separately?
>
> Hello,
>
> it's a "transcoder" test, but without transcoding between video
> formats, the vmu just adds a logo (a watermark) into the video.
>
> At the same time the vmu performed several actions:
> - receiving a streamed video via udp
> - adding a logo to the video
> - sending the streamed video via udp
>
> But I think I can split up the test into the following subtests and
> provide further performance values Sub test 1 receive: - Receiving
> the video from network (udp) and saving locally Sub test 2 transmit: -
> Reading the video from local ressource and sending via network Sub test 3
> process: - Reading the video from local ressource, adding the logo to the
> video stream and saving it again locally.
>
>
We have a known issue with udp transmits, you might be hitting that.
Please do separate your tests so we can see what the root cause is.
--
I have a truly marvellous patch that fixes the bug which this signature is too
narrow to contain.
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