[Freeswitch-users] KVM vs. XEN virtualization

[Dmitry Lysenko]

2015-04-12 21:01 GMT+03:00 Sergey Safarov <s.safarov at gmail.com>:

> 1) But in your case, cyclictest can generate 336000 (42*8000) hardware
> timer irqs per second VS 8000 from TDM card's.
>
> Very interest results.
> My example creates a lot of unnecessary interruptions
> For VoIP only host more correctly measured so
> cyclictest -t42 -p -d 80 0 -n -i -l 5000 6000
> or
> cyclictest -t42 -p -d 80 0 -n -i -l 10000 3000
>
> If FS has one TDM cards then
> cyclictest -t1 -p -d 80 0 -n -i -l 125 240000
>
> If two TDM cards
> cyclictest -t2 -p -d 80 0 -n -i -l 125 240000
>
> Where "-t" key equal number of TDM cards
>

In any case, I recommend adding the interval between threads.


> 2) According to Digium sources your TDM card have 20ms max buffer size(3ms
> default)
> USB dongles have at least 20 ms.
>
> Can you describe how you have found this information. It is very interest.
>


I looked into TDM card's driver sources and on the internet.
Now I found another page and according to this page they increase card's
FIFO to 16ms,
and reduce maximum latency from 20ms to 12ms.
http://git.asterisk.org/gitweb/?p=dahdi/linux.git;a=commit;h=ae5fa08abd1b898c0c080927e75c7249b3982c2d


As for USB dongles I hope you will be trust Giovanni. Giovanni already said
about 20ms frames.

Dmitry.

[rest was too long, skipped]
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