[vfio-users] problem with hugepages and sound

[Janusz]

W dniu 04.11.2015 o 22:41, Tomasz Jan Góralczyk pisze:
>
> On 04/11/15 20:15, Janusz wrote:
>> Hi,
>> I have two questions,
>> Sometimes I have some short freezes and fps drops in GTA 5, so I wanted
>> to try hugepages if it would give me better perfornance, but in fact it
>> gave me -10 fps and drops to 20-30 fps (while without it I have 60 with
>> drops to 40). Did anyone experiecned worst performance with hugepages?
>> maybe I am doing something wrong?
>> my script: https://bpaste.net/show/9089719cbef8
>>
>> Second question, I know this is vfio group but I don't know where else
>> would be better to ask, becauseeverywhere where I asked, no one know how
>> to fix it. I am using pulseaudio and I have some audio glitches, some
>> crackles, don't know exactly how to describe it... It looks like VM is
>> affecting my audio even before OVMF loads (starting VM) and it happens
>> the whole time when I get some sound from VM. anyone know what can cause
>> this? I tried different soundhw, sometimes I didn't get any disortion in
>> the sound, but then the sound was behind something like 1 second. I have
>> the same frequency in pulsaudio set like in windows settings. I even
>> bought usb sound card, to passthrough it and redirect this sound from VM
>> into my main sound card - poor quality. also tried streaming from
>> windows by linco, ssh and pacat - got some delays, port of pulseaudio
>> for windows - didn't managed to make it work... I know there is one more
>> alternative - Jackd, but maybe someone have idea how to fix it before I
>> start looking in jackd configuration...
>> I also tried without pulseaudio on host, just alsa, and didn't helped
> I also had the same problem with audio and the only way I could fix it
> was by passing through my onboard sound card via vfio. I had to `rmmod`
> the snd_hda_intel module before binding the sound card's vfio group to
> make it work. Obviously, it's not ideal since the card can't be shared
> between the host and the guest, but you already have an USB soundcard,
> so why not use that on the host? After I'm done with the guest, I shut
> it down, unbind the sound card's vfio group and `modprobe` the
> snd_hda_intel module to get audio back up on the host. Note that
> Pulseaudio won't let you unload your sound card's kernel module, while
> it's running.
>
> I have an ASUS Z97 board and a 4790k, so ymmv.
>
>
this is some kind of way of solving this, but I only want to get sound
from games in VM, and I want sometimes listen some music on host, have
TeamSpeak running, or watch some movie without turning off VM. If this
is common issue, I wonder why still no one was able to fix this