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Re: kvm win8 guest audio is terrible.

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Den 31.05.2019 01:51, skrev R. Ramesh:
>> More info needed:
>>
>> - HW (cpu, graphics, soundcard)
> Motherboard audio. I think it is realtek alc 887.
So, bog standard. Should work.
>>
>> - BIOS (cpu power-states)
> Guest cpu? Not sure how to answer this. I did not do anything special. 
> My command looks something like this
>
No, bare metal. If the box takes a nap, sound will stop. Even 1 ns might 
be audible.
> /usr/bin/kvm -usbdevice tablet -full-screen -localtime\
> ?????? -vnc $vnc -k en-us \
> ?????? -drive file=$diskC,index=0,media=disk,cache=writeback \
> ?????? -vga qxl\
> ?????? -m 2047 -net nic,model=virtio,macaddr=$mac \
> ?????? -net tap,ifname=tap2,script=no\
> ?????? -soundhw all &
I use pass-thru hdmi, and sound on that. Works well. Can't put my finger 
on anything you are doing wrong. I believe vnc is more light-weight than 
spice, so, good I believe.
>
>>
>> - Host setup (power states,audio setup)
> Host is core-i5 cpu. Here is the first few lines of cpuinfo
> processor???????????? : 0
> vendor_id???????????? : GenuineIntel
> cpu family?????????? : 6
> model???????????????????? : 42
> model name?????????? : Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz
> stepping?????????????? : 7
> microcode???????????? : 0x18
> cpu MHz???????????????? : 1651.812
> cache size?????????? : 6144 KB
>
Should have enough oomph. Throttled to half speed I see. Might want to 
set policy "performance". Again, check bios settings, and also power 
policy in host OS.
>
>>
>> - VM config.
> I think my kvm command line answers this. If not, please let me know 
> what you are looking for.
>
No further questions your honour. :-) . Can't help much I'm afraid.

If you have more than one usb-"card" on your pci-bus, you might try to 
pass one directly to the guest, and use an USB sound-card, to by-pass 
all emulation. I do that for on guest I have (XEN, not kvm). Works 
OK-ish. USB-chips are finicky though, so it might not work. Different 
PCI devices might be on single chip that don't like to run on separate vm.

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Re: Re: kvm win8 guest audio is terrible. "R. Ramesh" <rramesh@verizon.net> - 2019-05-31 02:10 +0200
  Re: kvm win8 guest audio is terrible. Håkon Alstadheim <hakon@alstadheim.priv.no> - 2019-05-31 02:40 +0200

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