linuxaudio.org

On Wed, Jun 30, 2010 at 02:27:09PM +0200, Adrian Knoth wrote:
> Let me just show you the result from my Midisport USB 2x2 (standard

quoted text
> edition when it was still produced by midiman, not the anniversary

> edition):

>

> set_realtime_priority(SCHED_FIFO, 20).. done.

> clock resolution: 0.000000001 s

>

> > latency distribution:

> ...

>   3.1 -  3.2 ms:        1 #

> ...

>   3.9 -  4.0 ms:        1 #

>   4.0 -  4.1 ms:     9903 ##################################################

> ...

>   5.0 -  5.1 ms:       95 #

>

> > SUCCESS

>

>  best latency was 3.13 ms

>  worst latency was 5.00 ms, which is great.

I've no idea how this test works, but if it uses the same

interface for TX an RX the results should be treated with

a healthy dose of scepticism. 
To be really reliable, the transmitter and receiver should

be on different machines. Measuring absolute latency can

be difficult in the case (but not impossible) but jitter

is easy.
Ciao,
--

FA
O tu, che porte, correndo si ?

E guerra e morte !

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