<div dir="ltr"><div class="gmail_default" style="font-family:'arial black',sans-serif;font-size:large;color:rgb(0,0,153)"><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jul 15, 2014 at 11:22 PM, Marc-André Lureau <span dir="ltr"><<a href="mailto:mlureau@redhat.com" target="_blank">mlureau@redhat.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Hi<br>
<div class=""><br>
----- Original Message -----<br>
> Hi All,<br>
><br>
> We have been piloting deployments of VM using Fedora 20 host and guest<br>
> and have been very happy with performance and stability in almost every<br>
> respect, so a big thanks to all for this hard work. Things are looking<br>
> great.<br>
><br>
> Now we have been testing deployments of these same VMs (F20 guests) on<br>
> rhel 7 (centos 7). We migrated one over and one of the issues seems to<br>
> be a severe degradation of video performance vis-a-vis the F20 host.<br>
<br>
</div>The difference between rhel7 and f20 host is quite surprising. I get<br>
quite bad performance with f20 host as well (spice 0.12.4-3, qemu 2.0.0-5)</blockquote><div class="gmail_default" style="font-family:'arial black',sans-serif;font-size:large;color:rgb(0,0,153)">Hi, I got confused long time ago, actually, the performance between </div>
<div class="gmail_default" style="font-family:'arial black',sans-serif;font-size:large;color:rgb(0,0,153)">centos and fedora is quite different, as installing win7 guest for example, </div><div class="gmail_default" style="font-family:'arial black',sans-serif;font-size:large;color:rgb(0,0,153)">
10min for centos host, but 1h for fedora host! </div><div class="gmail_default" style="font-family:'arial black',sans-serif;font-size:large;color:rgb(0,0,153)">Maybe the reason is the difference of IO behavior, but I'm not sure.</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"> <br></blockquote><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Are your host configured with the same spice settings (in particular<br>
streaming-video and other compression settings) ?<br>
<div class=""><br>
> The setup is a C7 host, F20 guest and either C7 or F20 client, either<br>
> local to the host or on the LAN.<br>
><br>
> In this setup, the video plays fine for a few seconds, but eventually<br>
> degrades to about 1fps with severe tearing of the video. Video does<br>
> remain in sync with audio and there are no audio breakups.<br>
><br>
> Any pointers on things to try?<br>
<br>
</div>I have been investigating some video rendering issues with rhel7 guest<br>
on rhel7 host, see <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1030024" target="_blank">https://bugzilla.redhat.com/show_bug.cgi?id=1030024</a><br>
<br>
However, even with the cogl fix and "PutImage BIG-REQUEST", the video<br>
regions seems to vary too much for the Spice video filter to perform<br>
well (using firefox/html5 video youtube). I believe it will need to be<br>
improved.<br>
<br>
(the cogl fix allows much more accurate region invalidation, the<br>
big-request allows to update whole region atomically and not by chunks)<br>
<div class=""><br>
> I'm willing to rebuild some host components (e.g. spice-server or qemu<br>
> or whatever) or try some patches or configuration changes to address<br>
> this to track it down.<br>
<br>
</div>Your help would be most welcome to investigate and improve this further.<br>
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