Xmms FreeBSD and buzzing or skipping sound

[Jason Henson]

On 01/21/05 07:29:43, Grégory Nou wrote:
> Jason Henson a écrit :
> 
>> On 01/20/05 20:57:12, Derek wrote:
>> 
>>> Collin McClendon wrote:
>>> 
>>>> I've noticed for quite some time (at least on 5.x even before -  
>>>> CURRENT) that if I'm unzipping or tarring a file that it is enough   
>>>> to make xmms play mp3s with intermittent buzzing. I have a fairly   
>>>> fast machine, dual athlon 1.53 Ghz with 1 GB of ram and a fully  
>>>> scsi  setup, 4 10K maxtors in a Raid 0 stripe set.
>>> 
>>> 
>>> Did you ever find a solution to this Collin?
>>> 
>>> I've got a 5.3-STABLE SMP machine, with a promise RAID controller,
>>> RAID1, with snd_emu10k1.ko, and I get the same results...  Re- 
>>> nicing
>>> xmms doesn't help either...
>>> 
>>> Cheers,
>>> Derek
>>>
>> 
>> Could this be a problem of resource hoging on the pci bus?  Are the   
>> devices on different irqs?
>> 
>> I just tried it without problem, but it was a small file.  I have a   
>> single 2ghz athlon with builtin audio and a single ide drive.
> 
> I have this problem too.
> It happens with any mp3 player or listening to an icecast stream, but  
> not with mplayer when looking at a divx. I looked at the irqs, and  
> have uhci2 and my pcm0 on the same irq. However, this problems occurs  
> only after 3 or 4 hours of uptime, generally.
> Should I try to change my irqs ? and if positive, how do I do this ?  
> in the bios ? (note : I have also uhci1 on the same irq than vr0, and  
> it makes my computer crash at the end of the shutdown, when using the  
> GDM to shutdown)
>

Something like hw.acpi.pci.link.0.6.0.irq=16           #irq pcm in / 
boot/loader.conf.  Maybe you could also try changing the pci clock, by  
this I mean the number of tics or cycles a device can control the bus.   
I have mine set to 96.  A number between 96-128 usaully increases  
performance of some pci devices on bench marks I have.  You should  
search for some of them to see if there is a good setting for your pc.