On Tue, Jul 15, 2014 at 11:22 PM, Marc-André Lureau <mlureau@xxxxxxxxxx> wrote:
Hi
The difference between rhel7 and f20 host is quite surprising. I get
----- 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.
quite bad performance with f20 host as well (spice 0.12.4-3, qemu 2.0.0-5)
Hi, I got confused long time ago, actually, the performance between
centos and fedora is quite different, as installing win7 guest for example,
10min for centos host, but 1h for fedora host!
Maybe the reason is the difference of IO behavior, but I'm not sure.
Are your host configured with the same spice settings (in particular
streaming-video and other compression settings) ?
I have been investigating some video rendering issues with rhel7 guest
> 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?
on rhel7 host, see https://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.
(the cogl fix allows much more accurate region invalidation, the
big-request allows to update whole region atomically and not by chunks)
Your help would be most welcome to investigate and improve this further.
> 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.
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