On Sat, 4 Jun 2022 at 14:00, Bronek Kozicki <b...@incorrekt.com> wrote:
> Hi > > My CPU/motherboard combo does not seem to support virtual interrupt > controller and so far I am not getting much help to fix this (the > motherboard is Gigabyte MZ72-HB0 rev 3.0 and the CPU is EPYC 7413 - > apparently AVIC no longer works on EPYC 7003 CPUs; there is 256GB RAM > attached to each of two sockets, total 512GB). > > I am trying to figure out configuration to minimize the sound latency in > the virtual machines (i.e. minimize crackling) without AVIC. Sound is > provided by an USB audio interface attached to USB card which is passed > through with vfio. USB card model is > https://www.startech.com/en-gb/cards-adapters/pexusb3s42v (it has two > independent USB controllers; a different variant of this card has 4) > > > As a test, try to re-run your tests without any disk access. HDD or SSD. Please tell us if that improves the situation or not. If that improves the audio, you can then look into the disk access area to try to minimise the duration of sustained disk access. For the tests, you can use a ramdisk / tmpfs instead of a physical disk if you need to store/read data somewhere temporarily, and then copy it to a real disk after the test completes. I ran into problems some time ago, with UDP packets being dropped during sustained disk accesses, so the sound device might also be affected by disk accesses. Kind Regards James
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