[Xen-users] guest video slow

[Mike Wright <nobody@xxxxxxxxxxxxxxxxxxxx>]

Hi all,

Been running xen since 2.something and now have a situation I've been 
chasing for months on end without resolution.
There is a system whose guests' video, whether via ssh -Y or vnc is very 
slow. You can see it "paint" the screen every 3/4 second or so.
Host ubuntu (14.04 thru 15.10) guest (started at 14.04, now 16.04).

Prior to a catastrophic crash that took out my internal and external 
drives I was running Fedora with 5 fedora guests, each running gnome3 
desktops, and was able to have all 5 of them running concurrent video 
streams, with a vnc window open to each, in real time with no delay, so 
I know xen can easily handle this.
Hardware is 3-core amd phenom, 16g ram, on a gigabyte mobo.
Software is now at xen-4.5 w/ ubuntu-15.10. Kernel is down rev 3.19 
because the 4.x kernels don't recognize one of my drives.
It's hard to say it's ubuntu vs. fedora and am guessing it's something 
to do with my guest config.  Here's the part re video:
vbf = [
  'sdl=1',
  'vnc=1',
  'vncdisplay=0',
]

I've tried all sorts of variations with these but truth is I'm shooting 
in the dark.  As xen has evolved so has its documentation; a lot of it 
is undated, much of it is contradictory, most of it is scattered.
Does anybody have any ideas?  Where do I go from here?   Could it be an 
ubuntu problem? Does my config make sense?  straw(grasp);
Thanks for any help,
Mike Wright

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