[LAU] Estimating JACK latency

Joel Roth joelz at pobox.com
Thu May 3 02:51:03 UTC 2012

On Tue, Apr 17, 2012 at 05:09:52PM +0000, Fons Adriaensen wrote:
> The nominal roundtrip-delay (physical input to physical output
> if you connect the corresponding ports directly) is period * nperiods.
> 1 * period occurs at the input, (nperiods - 1) * period at the output.

If this is correct, Patrick Shirkey should update his page at



    p affects input latency: how long from when a piece of data
    arrives at the audio interface connectors until user space
    software can use it?

    p*n affects output latency: how long from when a piece of
    data is delivered by user space data until it leaves the
    audio interface connectors?

    Roundtrip latency is combination of these two.

Joel Roth

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