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

[leesteken at pm.me]

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/