[vfio-users] problem with hugepages and sound

[Tomasz Jan Góralczyk]

This is purely an audio issue. When I was trying to get audio out of
qemu, the entire VM would block (hang) when audio slowed down and went
out of sync. Audio in qemu is *not* asynchronous. This is likely the
reason why you're experiencing FPS drops.

I'm guessing the synchronous audio issue might be exaggerated by GPU
passthrough, since QEMU has no idea about A/V sync with "-nographic"
enabled and can't figure out audio buffer sizes on its own.

On 06/11/15 21:01, Janusz wrote:
> W dniu 05.11.2015 o 01:14, Eddie Yen pisze:
>> I'm still solving sound issue either, but for FPS problem, I saw your
>> scripts.
>> Seems like you didn't add Hyper-V functions on -cpu signs.
>>
>> It's necessary to delete Hyper-V functions if using NVIDIA GPU, but
>> you're using AMD, so you can add Hyper-V functions on your -cpu sign. 
>>
> I just tried with Hyper-V, (its now: -enable-kvm -m 8000 -cpu
> host,hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time  -smp
> 8,cores=4,threads=2,sockets=1) but I don't see any performance boost.
> But I found that problem with sound is causing fps drops (its every 5-10
> seconds) - turned off sound completely and don't get any fps drops. so
> definitely will have to try Jack2 on VM  and host as I don't see any
> other alternative to it now, and I read that it can run without such
> delays over network.
> 

-- 
 Tomasz Jan Góralczyk
 tomg [at] fastmail [dot] uk
 PGP: 0x9A1735E96B636FC1

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