If you start pd in sudo, you have to connect to jack in sudo mode. Thus start jack in sudo (or gksudo for qjackctl).<div><br></div><div>I advise to use an rt kernel too. See documentation of Ubuntu Studio.<br><br><div class="gmail_quote">

On Tue, Oct 12, 2010 at 3:27 PM, Raphael Raccuia <span dir="ltr">&lt;<a href="mailto:rafael.raccuia@blindekinder.com">rafael.raccuia@blindekinder.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

Hi list,<br>
I tested Pd rt as I need low latency for a performance next week...<br>
It seems -rt flag doesn&#39;t have any effect. I measured Pd latency with<br>
jdelay, and always get 640 (@48000), so about 13ms (pd only)... lower I<br>
set buffer in jack (no less than 256), more DIO errors I get... and<br>
there are a lot! This setting works great with many application<br>
(Ardour...), with about 10ms (~15 really). So I would have ~25ms, which<br>
is acceptable, but too many DIO errors!<br>
<br>
-what is -defeatrt setting? (I tried 0 and 1, no change)<br>
-why is -rt flag without effect?<br>
-tried nosleep, no change...<br>
<br>
I also tried to start pd in root (sudo)...<br>
<br>
It says:<br>
priority 8 scheduling enabled.<br>
priority 6 scheduling enabled.<br>
(which I normally don&#39;t have)<br>
<br>
but unfortunately can&#39;t connect to jack (state 17)<br>
<br>
thank&#39;s for your help<br>
<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Pedro Lopes (ongoing MSc)<br>contact: <a href="mailto:pedro.lopes@ist.utl.pt" target="_blank">pedro.lopes@ist.utl.pt</a><br>website: <a href="http://web.ist.utl.pt/Pedro.Lopes" target="_blank">http://web.ist.utl.pt/Pedro.Lopes</a> <br>


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