Sound performance problems in FreeBSD

Ronald Klop ronald-freebsd8 at
Sun Sep 26 06:14:39 PDT 2004

On Fri, 24 Sep 2004 00:15:20 -0700, Ryan Freeman <ryan at> wrote:

> hello, sorry to drag up a slightly outdated topic, but i just installed  
> 5.3beta5
> and i'm having the same issue. the last time i used freebsd was back in  
> march at
> version 5.2 and 5.2.1. the issue existed then too, hence trying out  
> 5.3beta5 now to
> see if it was gone. while it isn't gone, i'm glad to see people are  
> finally noticing
> the problem as more than just "oh your hardware must be faulty". i ran  
> the following:
>> An easy way to reproduce these
>> skips is to run `while true; do sysctl vm.vmtotal; done`, while
>> playing an mp3.
> and i get the nice "person being removed from the matrix" effect.  
> haven't yet tried
> the patch, but i want to get on that asap. can anyone else verify that  
> the patch
> works? and furthermore, is it going to be worked into the freebsd source  
> post-haste? ;) thanks,
> - ryan
> hardware includes: athlon xp 1900+, 768mb DDR, sblive 5.1.

I have this also. Machine: P-III 500Mhz
cat /dev/sndstat
FreeBSD Audio Driver (newpcm)
Installed devices:
pcm0: <Creative EMU10K1> at io 0x2060 irq 11 kld snd_emu10k1 (4p/2r/4v  
channels duplex default)

I notice a lot of system time is used when running the loop. I presume  
system time has higher precedence than user time.


  Ronald Klop
  Amsterdam, The Netherlands

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