thx for the quick reply iohannes,
so your setup should be something like pd->jack->alsa->hdsp
(yesterday this gave me about 13ms latency which is quite ok)
ok, it's actually the way it's running but i can't get this latency though on my laptop (P4 2Ghz) i can run jack @96khz with a setting of 256 frames with no xrun, and that should give me a latency of 5.33 ms. Now if start pd -jack, some xrun start to occur and audio is periodically choppy.(note: if pd is running in -rt, audio seems to be stable but i guess i have to make some intense tests before assuming it's a correct setup).
If i really want to have it the "safe" way i must use a framesize of 1024... :(
so i'm just curious about this, is there things to improve for the "safe" method or is it just a normal behaviour, is it ok to run pd in -rt as it seems to enable lower audio latency with no click'n'pops ?