Re: [GnomeMeeting-list] How to fix sound choppy on CPU load?

[Johnny Strom <jonny strom netikka fi>]

jonny strom netikka fi wrote:
> Hi
>
> What kind of soundcard do you have?

I was thinking that the size of the buffers in the sound driver can
make a diffrence on the sound quality under load, and what you could 
test is to patch your kernel with the Preemptible Kernel patch:

http://www.tech9.net/rml/linux/


Cheers Johnny




> Mihai T. Lazarescu wrote:
>
> > Hi Damien,
> >
> > Thank you for your reply.
> >
> >
> > > Le mer 05/11/2003 à 19:20, Mihai T. Lazarescu a écrit :
> > >
> > > > It behaves the same on a PIII 600MHz using oss and an Athlon
> > > > 1GHz using ALSA.
> > >
> > >
> > > That's not normal. I have already used GnomeMeeting on a Pentium 233 MHz
> > > with 64Megs of RAM in the past. Does it only happen on high-activity?
> >
> >
> >
> > Yes.  For example, a compilation would almost completely
> > block the sound.  Bursts of CPU utilization (such as moving
> > around quickly a window in opaque mode) halts the sound and
> > image movement.  Less than 100% CPU use (such as moving slowly
> > the window) would not interfere with GM operation.
> > Disk activity with low CPU usage (e.g., a find) does not
> > interfere as well.
> >
> > I also have set up the suggested workaround to NPTL bug
> > (which improve things for xine's GUI, for example) but it has
> > no effect.
> >
> >
> > > We have other RedHat 9 users who do not have problems.
> >
> >
> >
> > I'd be glad to be among them! :-) :-)
> >
> >
> > > I wonder :
> > > - when it happens, does GnomeMeeting take 100% of the CPU?
> >
> >
> >
> > No, but some other process does.  As soon as the process
> > consuming CPU stops, the CPU utilization comes down to normal
> > (roughly 10-20% on PIII 600MHz).
> >
> >
> > > - what is your load average when it happens?
> >
> >
> >
> > It surely happens when there are other processes requesting 100%
> > CPU, no matter if I raise gnomemeeting priority to -20.
> >
> > If there is a process that uses the CPU in bursts of 100%,
> > the sound choppiness follows relatively accurate the CPU usage.
> >
> >
> > > - are things normal on normal CPU load?
> >
> >
> >
> > Yes, I have continuous sound and image movement.
> >
> > Many thanks for your support,
> >
> > Mihai
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>
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