8 Aug
2019
8 Aug
'19
12:11 a.m.
On Thu, 8 Aug 2019 12:49:42 +0900, crocket wrote:
On Thu, Aug 8, 2019 at 3:31 AM Ralf Mardorf wrote:
Seemingly USB's packet size is the reason for the 1 ms cadence. I don't
have a clue if this is the case for USB 3. The Focusrite 3rd generation
Scarlett series are USB 3 audio interfaces, but I don't know if they
still work with Linux. At https://www.gearslutz.com/ forums you could
ask and probably would get a reply from Focusrite.
I once tested a Presonus Audiobox 1818VSL and I own a Focusrite
Scarlett 18i20 2nd generation, but I never tested 3 periods/buffer,
since 2 periods/buffer just do the job, even if the latency isn't a
multiple of 1ms. With USB I even get way lower latency than is
possible with a TerraTec PCI and a RME PCIe card on at least two used
Linux machines. On the newer machine I even don't unbind USB ports,
respl. I don't care about IRQs at all.
YMMV!
--
https://soundcloud.com/der-lichtecho-plan
On Wed, 2019-08-07 at 16:59 +0200, Holger Marzen
wrote:
Do recent usb soundcards need "-n 3"? What is the difference between
jackd -n2 -p192
and
jackd -n3 -p128
Anything other than -n2 is for esoteric reasons:
https://wiki.linuxaudio.org/wiki/list_of_jack_frame_period_settings_ideal_f…
There might be some truth behind the theory, but in practise
something like 128 or 256 frames, 2 periods/buffer at 48 KHz works
without issues.