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<div class="moz-cite-prefix">On 13/03/2013 11:39, Christophe Fergeau
wrote:<br>
</div>
<blockquote
cite="mid:20130313103955.GI30387@teriyaki.cdg.redhat.com"
type="cite">
<pre wrap="">On Tue, Mar 12, 2013 at 01:17:26PM +0100, Han Pilmeyer wrote:
</pre>
<blockquote type="cite">
<pre wrap="">I thought it might be nice to chime in with my results. I'm running
nearly the same versions, except that I'm still using the 0.30
version of the spice-guest-tools.
I just tested my network speed at the KVM host and in my Windows 7
guest. The largest difference was in the ping time which was doubled
in the guest (10 ms versus 5 ms in the host). The network bandwidth
was almost the same, i.e. in both cases download and upload was over
70 Mbps (to my ISP). Overall, I would say this is not too bad.
I usually have reasonable performance watching videos from within
the guest. The one thing where I do see issues is with Microsoft
Lync while trying to do audio or video calls with colleagues. This
works for several seconds (I've seen up to 20 or 30 seconds) and
then invariably the connection drops which Lync claims to be due to
a flaky network connection. I do not buy this at all. But somehow
Lync sees something about the KVM network connection that it doesn't
like.
</pre>
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<pre wrap="">
If you are using the virtio network driver, I'd try not using it to see if
this helps, and vice versa.
</pre>
</blockquote>
Excellent idea. I tried this today by replacing the virtio network
driver with the e1000 driver. Strangely enough this seemed to
improve the performance. The latency was lower and the bandwidth
higher with the e1000 driver. I did not notice additional CPU usage,
but I haven't done any measurements to substantiate that.<br>
<br>
Unfortunately it does not change the situation with Lync. I tried it
both as a NAT and as a bridged network. I also tried a different VPN
method, but nothing worked. I'll try it tomorrow from the office to
see if it works when I do not use a VPN.<br>
<br>
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