[Sugar-devel] [Csnd] Re: Re: Re: Re: csound on Fedora 11 and rawhide

[Paul Fox]

peter wrote:
 > On Tue, Sep 8, 2009 at 4:23 PM, Art Hunkins<abhunkin at uncg.edu> wrote:
 > > Victor, I understand you to be saying that pulseaudio exhibits more latency
 > > than ALSA.
 > >
 > > If this is so, why are we making pulseaudio the default for SoaS - where
 > > most audio will be realtime?
 > 
 > Because that's what Fedora and most other distros are moving to. Also

i think using pulseaudio on a distro which is almost by definition
aimed at under-powered machines is a mistake.  it's a very expensive
subsystem, performance-wise.  i seem to recall seeing it take 10% of
a 1Ghz system.

paul

 > it does add more latency but not enough that most users will notice.
 > Even if you use alsa it will connect to the alsa pulse audio provider
 > which will basically add even more latency Csound -> PA alsa provider
 > -> PA -> ALSA -> kernel.
 > 
 > It works fine in most cases even for VoIP. What requires such low
 > latency as to be an issue in an environment such as a learning one.
 > Will the children notice a few milliseconds?
 > 
 > Peter
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=---------------------
 paul fox, pgf at laptop.org