14 Feb
2016
14 Feb
'16
5:36 p.m.
On Sun, Feb 14, 2016 at 11:05:43AM -0500, jonetsu(a)teksavvy.com wrote:
/usr/bin/jackd -T -ndefault -dalsa -dhw:M1010LT
-r44100 -p512 -n2
configuring for 44100Hz, period = 512 frames (11.6 ms), buffer = 2
periods
1597.528 frames 36.225 ms total roundtrip latency
extra loopback latency: 61 frames
use 30 for the backend arguments -I and -O
/usr/bin/jackd -T -ndefault -dalsa -dhw:M1010LT -r44100 -p256 -n2
configuring for 44100Hz, period = 256 frames (5.8 ms), buffer = 2
periods
829.529 frames 18.810 ms total roundtrip latency
...
These numbers lead to the conclusion that the total latency is
3 * period_time + 1.4 ms.
Since you use -n 2, the 3 * probably means that you are using
jack2 (aka jackdmp) without the sync option. If you use that
option (or jack1) the latency will be one period time less.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)