[vfio-users] Not enough IRQs in 82093AA IOAPIC

[Ivan Volosyuk]

On recent qemu I switched to emulated usb audio. It works much better
than other options I tried (hda, ac97, scream):
qemu ... -device usb-audio,audiodev=myaudio \
 -audiodev id=myaudio,driver=pa,out.fixed-settings=on,out.frequency=44100,out.channels=2,timer-period=3000
I also use MSI for my nvidia graphics, which helps a lot in games, but
might be irrelevant to audio crackle improvements I've got with usb
audio.

On Mon, Sep 21, 2020 at 12:53 AM Patrick O'Callaghan <poc at usb.ve> wrote:
>
> On Sun, 2020-09-20 at 13:29 +0000, leesteken at pm.me wrote:
> > On Sunday, September 20, 2020 2:47 PM, Patrick O'Callaghan <poc at usb.ve> wrote:
> >
> > > On Sat, 2020-09-19 at 16:38 +0000, Zir Blazer wrote:
> > >
> > > > Note that while MSI Interrupts are always better, in many cases they are not enabled by default or are broken somehow. I see often in PCI Passthrough scenarios for Windows with people complaining about some type of audio stuttering that in many cases gets solved by explicitly enabling MSI, as the OS or the Drivers appears to not always do so. So even when using modern OSes legacy PCI Interrupts performance may be important.
> > >
> > > Slightly OT: I sometimes get audio stutter on Windows passthrough. How
> > > do I enable MSI interrupts?
> >
> > Please have a look at https://vfio.blogspot.com/2014/09/vfio-interrupts-and-how-to-coax-windows.html
> > Or https://forums.guru3d.com/threads/windows-line-based-vs-message-signaled-based-interrupts-msi-tool.378044/
>
> Thanks, I'll take a look at those.
>
> poc
>
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