Re: [Alsa-user] arecord under 2.6.15.4-rt17 ->overruns...

[Lee R. <rlr...@jo...>]

On Thu, 2006-03-02 at 21:19 +0100, fons adriaensen wrote:
> On Thu, Mar 02, 2006 at 09:03:29PM +0100, Guennadi Liakhovetski wrote:
> 
> > chrt -f -p 50 `pidof "IRQ 5"`
> > chrt -f 40 arecord -t wav -f cd -d 600 test.wav
> > 
> > and if there's accidentally an updatedb running in the background, I get 
> > lots of "Overrun!!! (at least xxxms long)", where xxx can be hundreds of 
> > milliseconds.
> 
> Is arecord running as a RT process ? If not, it's normal it gets
> upset by the sort of disk acces from updatedb.
> 

It's not normal - on any sane distro updatedb runs at a high nice value.
And even if it doesn't, the scheduler should be smart enough to give
arecord the CPU often enough to avoid underruns even under high disk
load.

Lee