[Bug 37102] Audio lags 5-10 sec even over gigabit network

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37102

--- Comment #1 from gvenkat at attglobal.net 2011-05-14 16:22:44 PDT ---
This has become annoying enough to be not usable at all for anything with
audio.

I did some for empirical testing to see where the problem may be.

Here are some observations:

1. When the audio starts to lag, the lag varies. Sometimes, it happens right at
the Windows logon sound, sometimes later. But once it happens, the audio is
consistently offset by that delay for further use, ie., there is no "catching
up" possible even if you leave the guest and host on with no further audio
sounds.

2. If I move to a different client machine and start spice client from there
for the same guest desktop, the delay continues at that new client. This seems
to suggest that the problem is at the host/guest end, not the client end. This
client move could be to the host itself so that removes any network issues as
being the problem.

3. To narrow it down between the guest and the host spice server, I bring up
another VM guest and test. This seems to exhibit the same delay (not 100% sure
about this but this test case should be tried). If this is consistent, then the
problem would likely be in the spice host server, rather than in any guest
drivers.

I am running the 0.8.1 version of spice-server on OpenSuse 11.4 with KVM 0.14
as mentioned earlier.

Anyone care about this? Any suggestion on what other empirical testing I can do
to isolate it?

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