[Spice-devel] video performance in rhel/centos 7 vs fedora 20

[David Mansfield]

Hi All,

We have been piloting deployments of VM using Fedora 20 host and guest 
and have been very happy with performance and stability in almost every 
respect, so a big thanks to all for this hard work. Things are looking 
great.

Now we have been testing deployments of these same VMs (F20 guests) on 
rhel 7 (centos 7). We migrated one over and one of the issues seems to 
be a severe degradation of video performance vis-a-vis the F20 host.

The setup is a C7 host, F20 guest and either C7 or F20 client, either 
local to the host or on the LAN.

In this setup, the video plays fine for a few seconds, but eventually 
degrades to about 1fps with severe tearing of the video. Video does 
remain in sync with audio and there are no audio breakups.

Any pointers on things to try?

I'm willing to rebuild some host components (e.g. spice-server or qemu 
or whatever) or try some patches or configuration changes to address 
this to track it down.

-- 
Thanks,
David Mansfield
Cobite, INC.