Re: [LAU] Latency and USB interfaces

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To: James Stone <jamesmstone@...>
Cc: A list for linux audio users <Linux-audio-user@...>
Date: Wednesday, January 8, 2014 - 5:35 pm

On 01/08/2014 05:54 PM, James Stone wrote:

[..]

try 128/3 or 96/2 .. See the excellent recent explanation from Clemens
on that subject:
http://lists.linuxaudio.org/pipermail/linux-audio-user/2013-December/095...

[..]

> Also, how meaningful is the reported jackd buffer size in terms of

jack buffer size is only meaningful within jack.

Additional latency introduced by hardware depends on the hardware.
As with any complex system where you cannot precisely know what is
happening: measure it, with jack_delay (or it's son jack_iodelay which
is included with jackd these days).

Results for some USB devices:
http://robin.linuxaudio.org/tmp/vsl1818latency.png
http://wiki.linuxaudio.org/_detail/wiki/jack_latency_tests/latency-ua25-...
created with http://gareus.org/gitweb/?p=latentor.git

You'll find some patterns and there usually is a relationship between
the jack-buffersize and the actual round-trip latency. But it's
different for different hardware (and to some extend also
software/drivers,.. the whole stack)

ciao,
robin
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Messages in current thread:
[LAU] Latency and USB interfaces, James Stone, (Wed Jan 8, 4:54 pm)
Re: [LAU] Latency and USB interfaces, Robin Gareus, (Wed Jan 8, 5:35 pm)
Re: [LAU] Latency and USB interfaces, Tim Goetze, (Thu Jan 9, 11:31 am)
Re: [LAU] Latency and USB interfaces, Clemens Ladisch, (Thu Jan 9, 12:18 pm)
Re: [LAU] Latency and USB interfaces, Tim Goetze, (Thu Jan 9, 1:26 pm)
Re: [LAU] Latency and USB interfaces, Clemens Ladisch, (Fri Jan 10, 7:48 am)
Re: [LAU] Latency and USB interfaces, James Stone, (Fri Jan 10, 10:31 am)