[Spice-devel] unwatchable choppy performance using fullscreen flash in windows VM

[Alon Levy]

On 10/16/2014 04:25 AM, Greg Sheremeta wrote:
> Hey all,
> 
> Using a high-end Fedora 20 host, I get very poor choppy performance running flash full-screen
> in a Windows VM. I need to use Windows due to DRM stuff (nflsundayticket.tv). I've tried
> different virtual graphics adapters, but nothing helps. Attempting 1920x1080. Flash 15.
> Using remote-viewer or virt-manager, spice, QXL is set to 64 MB RAM.
> 
> Some googling suggests that QXL just can't handle 1920x1080 flash fullscreen.
> 
> Using VirtualBox gives pretty flawless performance at 1920x1080. But I want to use
> virt-manager / virt-viewer and KVM, of course :)
> 
> I've also had success using VLC to stream the non-maximized flash player from the windows
> guest to the host, and then VLC scales up on the host (using host hardware acceleration,
> I think). But this is a bit of a pain to manage.
> 
> One option I've read about is passing through a graphics adapter. My host machine has
> my primary nvidia card, but it also has the onboard Intel adapter that I don't use. Maybe
> if I can pass this Intel card through, I'd get the performance I'm looking for. From what
> I can tell, this isn't quite ready for primetime.
> 
> I know about the 64bit vram bar, but I haven't tried it for this. Would it help?
> 
> Any other ideas?

Try turning off image compressoin: -spice image-compression=off,<other
options>

> 
> Thanks,
> Greg
> 
> Greg Sheremeta
> Red Hat, Inc.
> Sr. Software Engineer, RHEV
> Cell: 919-807-1086
> gshereme at redhat.com
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