[PD] Latency under Linux/Jack (again...)

[Pierre Massat]

What OS do you use? You need a rt kernel in order to get low latency
(assuming your computer reasonably recent).

2010/10/12 Raphael Raccuia <rafael.raccuia at blindekinder.com>

> Hi list,
> I tested Pd rt as I need low latency for a performance next week...
> It seems -rt flag doesn't have any effect. I measured Pd latency with
> jdelay, and always get 640 (@48000), so about 13ms (pd only)... lower I
> set buffer in jack (no less than 256), more DIO errors I get... and
> there are a lot! This setting works great with many application
> (Ardour...), with about 10ms (~15 really). So I would have ~25ms, which
> is acceptable, but too many DIO errors!
>
> -what is -defeatrt setting? (I tried 0 and 1, no change)
> -why is -rt flag without effect?
> -tried nosleep, no change...
>
> I also tried to start pd in root (sudo)...
>
> It says:
> priority 8 scheduling enabled.
> priority 6 scheduling enabled.
> (which I normally don't have)
>
> but unfortunately can't connect to jack (state 17)
>
> thank's for your help
>
>
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