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

[Programmingkid]

On Oct 28, 2015, at 6:58 AM, Stefan Hajnoczi wrote:

> 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?

I think a better question is who is going to spend the time and energy 
trying to answer these questions?

How about this, we apply the patch for now, and if someone does figures
out a better way of solving this problem, we use the better way in the future.