[Qemu-devel] Re: KVM: High CPU load with audio enabled

[malc]

On Tue, 9 Nov 2010, Jan Kiszka wrote:

> Am 09.11.2010 00:48, Michael Tokarev wrote:
> > 08.11.2010 15:40, Stefan Pietsch wrote:
> >> Hi,
> >>
> >> I'm running a Windows XP guest in KVM. After enabling the audio support
> >> (-soundhw es1370) the CPU load of the KVM process in the host system
> >> goes up to 100%.
> >>
> >> Tested with: qemu-kvm-0.13.0 Debian 0.13.0+dfsg-1
> >>
> >> KVM start command: kvm -m 512 -hda xp.img -soundhw es1370
> >>
> >> Did you experience similar problems?
> > 
> > Yes, sound in 0.13 appears to be broken.  It is looping in
> > select/read loop forever, read returns EAGAIN and select
> > says the filedescriptor is ready.
> 
> Try to set QEMU_AUDIO_DAC_TRY_POLL=0 for the environment of the qemu
> process. That's long required to get sound out of the Musicpal emulation
> as well (malc, you may recall this). It even got worse with current
> qemu.git: previously, the sounds was just quirky. Now the system is
> booting way slower in polling mode and is partially not reactive anymore.

Wich driver is being used? ALSA stuff should have been fixed by Jindrich
Makovicka in:
38cc9b607f85017b095793cab6c129bc9844f441 and
22d948a2d97434192018bdabaf0a50cda7f994be


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