Re: [Qemu-devel] [PATCH] hw/usb/dev-audio.c: make USB audio card sound perfect

[Stefan Hajnoczi]

On Mon, Oct 26, 2015 at 01:24:00PM +0100, Gerd Hoffmann wrote:
> > So this change would make real-time audio feel laggy.
> 
> That is secondary if the sound quality is bad due to constant overruns
> and underruns ...

This is like sweeping network performance problems under the rug by
increasing queue size.

Before bumping the buffer size and breaking real-time applications (i.e.
128-512 samples per buffer), there should be a little performance
investigation to understand the root cause.

Why are overruns/underruns occurring?

Is the problem the host sound API, QEMU's audio/mixing infrastructure,
or guest responsiveness?

Stefan

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