11 Dec
2016
11 Dec
'16
3:50 p.m.
Hi Ralf,
On 04.12.16 16:28, Olli wrote:
I ran some more tests with jack_iodelay:
# Scarlett 18i20
Both connected input and output channels are on the same device.
## 48 kHz, 256 frames, 2 periods
total roundtrip latency: 1299,813 frames (27,079ms)
extra loopback latency: 531 frames
## 48 kHz, 256 frames, 3 periods
total roundtrip latency: 1796,813 frames (37,434ms)
extra loopback latency: 772 frames
## 48 kHz, 128 frames, 2 periods
total roundtrip latency: 705,813 frames (14,704ms)
extra loopback latency: 321 frames
## 48 kHz, 128 frames, 3 periods
total roundtrip latency: 834,813 frames (17,392ms)
extra loopback latency: 322 frames
# Scarlett 18i20 + OctoPre
Connected input and output channels are on different devices.
## 48 kHz, 256 frames, 2 periods
total roundtrip latency: 1349,806 frames (28,121ms)
extra loopback latency: 581 frames
## 48 kHz, 256 frames, 3 periods
total roundtrip latency: 1801,806 frames (37,538ms)
extra loopback latency: 777 frames
## 48 kHz, 128 frames, 2 periods
total roundtrip latency: 713,806 frames (14,871ms)
extra loopback latency: 329 frames
## 48 kHz, 128 frames, 3 periods
total roundtrip latency: 990,806 frames (26,642ms)
extra loopback latency: 478 frames
I did not test any higher framerates (e. g. 96 kHz) since my Laptop does
not run very stable at them.
Regards,
Olli
2. Do I
understand correctly, 64 samples cause more latency than 128
samples?
Looks like it. But I will also run jack_iodelay next weekend to to
measure some more settings and verify the results.