<div class="gmail_quote">On Tue, Oct 4, 2011 at 8:56 AM, Juraj Fabo <span dir="ltr"><<a href="mailto:juraj.fabo@gmail.com">juraj.fabo@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi,<br>
<br>
I read through the previous answers several times again and did some progress.<br>
I found out that the valid codec_ms values are <10ms,60ms> and using lower<br>
values will not work.<br>
<div class="im"><br>
>> 80 means a hardware interrupt is received every 10ms with 80 bytes per<br>
>> time slot. This is the recommended mode. A value of 40 will increase<br>
>> interrupt load and not necesarily reduce your latency, you must reduce<br>
>> the "user period", which is how often the driver will deliver<br>
>> media/data to the user application. This is done using<br>
>> sangoma_tdm_set_usr_period().<br>
>><br>
>><br>
</div><div class="im">>> The codec_ms is used to call sangoma_tdm_set_usr_period(). This is how<br>
>> often the driver will deliver data to the user application (for<br>
>> example, waking it up from select()).<br>
>><br>
<br>
</div>In each of the the test below the codec_ms was set to 1 with hope<br>
of fastest data delivery, however this resulted to 20ms codec_ms<br>
which is default.<br>
<div class="im"><br>
<br>
> Please, have a look at the results with various parameters used:<br>
> mtu:80 txqueue_size=1 rxqueue_size=1 one-direction delay=60ms<br>
> round-trip delay=120ms<br>
> mtu:80 txqueue_size=2 rxqueue_size=2 one-direction delay=80ms<br>
> round-trip delay=160ms<br>
> mtu:80 txqueue_size=10 rxqueue_size=10 one-direction delay=240ms<br>
> round-trip delay=480ms<br>
> mtu:40 txqueue_size=1 rxqueue_size=1 one-direction delay=40ms<br>
> round-trip delay=80ms<br>
> mtu:40 txqueue_size=2 rxqueue_size=2 one-direction delay=60ms<br>
> round-trip delay=120ms<br>
> mtu:40 txqueue_size=5 rxqueue_size=5 one-direction delay=120ms<br>
> round-trip delay=240ms<br>
> mtu:16 txqueue_size=1 rxqueue_size=1 one-direction delay=30ms<br>
> round-trip delay=60ms<br>
> mtu:8 txqueue_size=1 rxqueue_size=1 one-direction delay=25ms<br>
> round-trip delay=50ms<br>
> mtu:8 txqueue_size=10 rxqueue_size=10 one-direction delay=205ms<br>
> round-trip delay=410ms<br>
><br>
<br>
</div>Updated test result with the codec_ms=10 is following:<br>
mtu:16 txqueue_size=1 rxqueue_size=10 one-direction delay=20ms<br>
round-trip delay=50ms<br>
mtu:80 txqueue_size=1 rxqueue_size=10 one-direction delay=56ms<br>
round-trip delay=110ms<br>
<br>
However, this is still not 10ms with the default MTU:80 and codec_ms:10 :(<br>
<br>
Anyway, is it a good idea to use so assymetric tx/rx queue sizes?<br>
<br>
</blockquote><div><br></div><div>In general I don't think is a good idea because 99% of the user population is using default symmetric queues, moving to obscure/rarely-tested configurations increases your likelihood of facing problems. Having said that, I don't see why it should not work :-)</div>
<div><br></div><div>Can you share the code you're using to measure latency? may be setup a git repo in github with your code?</div><div><br></div><div><table border="0" cellspacing="0" cellpadding="0" width="648" style="width: 486.3pt; border-collapse: collapse; ">
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