[ardour-users] Weird lockup thing

[Jan Depner]

TAP Reverberator has a denormal problem that causes exactly what you are
describing.  Tom has built a new version that uses fixed point math
instead of floating point.  It is in CVS.  You can download it from the
TAP plugin web page.  I haven't had a chance to test it yet.  Why don't
you try it and post your results so Tom will know if it clears up this
problem.

Jan

 On Tue, 2004-06-15 at 09:16, Nathaniel Virgo wrote:
> I'm not sure whether to post this to mantis as I'm not sure if it's an 
> ardour or a plugin issue or just something odd about my system, but 
> every now and then when I'm playing with LADSPA plugins my system 
> suddenly becomes really sluggish, with the screen updating about once a 
> second.  So far it's only happened when using the TAP Reverberator or 
> the GLAME Highpass filter (and possibly with the Tube Amp with tone 
> controls, I can't remember).  It's also so far only happened when using 
> Ardour, although I haven't played much with plugins in other programs on 
> this machine yet.
> 
> Ardour doesn't get kicked out by JACK and the DSP usage meter doesn't go 
> up (it stayed at 11.2% last time it happened).  The response time gets 
> slower and slower as time goes on but if I manage to kill ardour or 
> disable the plugin before it gets too bad to do that it goes straight 
> back to normal.  If it gets too bad I have to reset the machine.  
> Sometimes I can hear a click at longer and longer intervals, which I'm 
> guessing is a buffer's worth of audio arriving at the soundcard.  It 
> seems to happen at a fairly random point when I've been using the plugin 
> for a while, but last time it happened it was just as the GLAME filter 
> stopped recieving any input, which makes me think it could be a denormal 
> thing maybe?
> 
> I'm using QJackCtl - my .jackdrc says /usr/bin/jackstart -R -t5000 
> -dalsa -dhw:0 -r44100 -p512 -n2.  This is a pretty standard Planet CCRMA 
> install and the problem happens in CCRMA's ardour beta11.2 and beta16.1 
> which I installed from the tarball.
> 
> It's a second-hand laptop so I'm not entirely sure about all the 
> hardware but the CPU is a P4 2.6 GHz, the soundcard is the onboard one 
> for the time being (driver seems to be snd-intel8x0 maybe?) and I think 
> most of the other stuff is made by SiS.
> 
> Any help you can give me or advice about where to report the problem to 
> would be much appreciated.  I can provide more information if you tell 
> me how to get it!
> 
> Nathaniel.
> 
> 
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