On 07/16/2014 05:39 PM, David Mansfield wrote:
On 07/15/2014 11:22 AM, Marc-André Lureau wrote:
Hi
----- Original Message -----
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 difference between rhel7 and f20 host is quite surprising. I get
quite bad performance with f20 host as well (spice 0.12.4-3, qemu
2.0.0-5)
Are your host configured with the same spice settings (in particular
streaming-video and other compression settings) ?
I have not specified any specific settings on the host for spice. If
there are differences in the defaults then I could play around with
that. Do you know what the differences might be?
In particular on the F20 side I have:
spice-server-0.12.5-2.fc20.x86_64
qemu-kvm-1.6.2-6.fc20.x86_64
And everything is peachy.
On c7 host I have:
spice-server-0.12.4-5.el7.x86_64
qemu-kvm-1.5.3-60.el7_0_0.2.x86_64
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 have been investigating some video rendering issues with rhel7 guest
on rhel7 host, seehttps://bugzilla.redhat.com/show_bug.cgi?id=1030024
However, even with the cogl fix and "PutImage BIG-REQUEST", the video
regions seems to vary too much for the Spice video filter to perform
well (using firefox/html5 video youtube). I believe it will need to be
improved.
I think these are both guest side fixes/changes, and my guest is F20,
(actually the exact same VM as was running before on F20 host, but now
on C7 host).
So I think the cogl fix is not relevant (and I'm not permitted to see
the PutImage BIG-REQUEST issue because it's a restricted bug).
I have tried rebuilding the spice-server package from F20 and
installing on C7 host, but it doesn't change anything.
Which leaves me with qemu changes. Is there a "version" of the qxl
hardware that's implemented in qemu that may be different?
Your help would be most welcome to investigate and improve this further.
I'll do my best :-) . Sometimes it's just a maze of twisty little
passages, all alike...
As a follow up to this, I finally got qemu 1.6.2 (SRPM from F20) rebuilt
on Centos 7. "Quite an ordeal" is an understatement BTW, but I did get
it built finally along with a bunch of pre-req.
Summary: video issues are fixed.
So something different between qemu 1.5.3 (from RHEL which includes 100s
of patches) and qemu 1.6.2 (from Fedora which includes 100s of patches)
has fixed the problem. spice-server was *not* touched.
If there's any way to narrow this down, I'll try it, but I have no idea
how to compare these two SW versions effectively.
On a side note, how/why is Fedora/RH carrying all of these downstream
fixes for QEMU? It's staggering. Are the upstream maintainers highly
unresponsive?
--
Thanks,
David Mansfield
Cobite, INC.
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