On Fri, Mar 31, 2006 at 11:06:35PM +0200, Edgar Toernig wrote:
> Vojtech Pavlik wrote:
> >
> > On Fri, Mar 31, 2006 at 01:07:34AM +0200, Edgar Toernig wrote:
> > >
> > > Latency is no problem. I'm using a userspace daemon to emulate
> > > the console beeper for about 6 months now and it work's very well.
> > >
> > > The daemon listens on /dev/input/eventX and when receiving a
> >
> > It needs to use /dev/input/uinput, not eventX. SND_TONE events are not
> > sent to the event devices.
>
> Well, I get them - stock 2.6.16.
Oh, yes, you're right. But still, this will only work if a speaker
device is present, so uinput is the right way to do it.
> > > Latency isn't noticable and memory footprint is small.
> >
> > It needs to have the sample ready in memory and not swapped out. Then
> > the latency will be OK, but if it needs to read it in from the disk, it
> > may be very noticeable.
>
> Yeah, if one ever cares one could mlock the samples, or (as I do) run
> without swap. Fixing the 'air' latency of 3ms/m is harder though *g*
--
Vojtech Pavlik
Director SuSE Labs
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