2016-09-13 16:43 GMT+02:00 Christophe Fergeau <cfergeau@xxxxxxxxxx>:
Hey,
On Tue, Sep 13, 2016 at 08:47:18AM +0200, Rob Verduijn wrote:
> Hello,
>
> I'm trying to improve my spice performance on a kvm host/guest.
> It's currently rather slow and I can see screens beeing build up, and
> delays when draging windows.
>
> It's being tunneled through openvpn, which is set to use tcp.
> tcp required because of the firewall which is maintained by 3rd party.
>
> I have full access to the kvm host, kvm guest and openvpn server.
>
> Have you got any tips so that I can improve spice performance ?
> I alrready am running tuned with the virtual-guest profile for guests and
> host profile for the host.
> All systems are runnning CentOS 7
>
> Any tips for :
> - the KVM host ?
> - the KVM guest ?
> - the openvpn server ?
I would try to minimize latency, and to get as much bandwidth as
possible, probably some tweaks can be done for that on the openvpn side?
Regarding QEMU, make sure you are using the QXL video driver as well as
the SPICE agent in the guest. There are also a bunch of compression
options that you can try to tweak, see
https://libvirt.org/formatdomain.html#elementsGraphics
Christophe
bandwith and latency are not mine to decide about
QXL-driver check
QXL-driver check
spice-agent check
tweaks in guest definition :
<graphics type='spice' port='5999' autoport='no' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
<graphics type='spice' port='5999' autoport='no' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
<image compression='glz'/>
<jpeg compression='always'/>
<zlib compression='always'/>
<streaming mode='all'/>
</graphics>
<jpeg compression='always'/>
<zlib compression='always'/>
<streaming mode='all'/>
</graphics>
I tried them on auto_glz,auto,auto,filter (tried every combo)
But I guess my bandwith is not stable and since setting them like this gives the best performance.
<gl enable='yes'/> gets an error if I add that to the config.
It says this option is included since 1.3.3 and centos has qemu-kvm 1.5.3
Did I forget something to enable this ?
<gl enable='yes'/> gets an error if I add that to the config.
It says this option is included since 1.3.3 and centos has qemu-kvm 1.5.3
Did I forget something to enable this ?
Rob Verduijn
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