Re: KVM: High CPU load with audio enabled

[Michael Tokarev <mjt@tls.msk.ru>]

09.11.2010 17:33, Michael Tokarev wrote:
> 09.11.2010 16:48, malc wrote:
>> On Tue, 9 Nov 2010, Jan Kiszka wrote:
>>
>>> Am 09.11.2010 00:48, Michael Tokarev wrote:
> []
>>>> 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
> 
> As far as I can see, both are in 0.13.0 release, which is
> the one I'm running currently.

Ok. This is wrong: neither of the two changes went into any
stable release.  Hence we've bugs which are long fixed but
no one knows about this.  As usual for qemu[-kvm] development.

/mjt