[asterisk-users] ConfBridge performance problem...?

Thorsten Göllner tg at ovm-group.com
Wed Feb 6 06:56:01 CST 2013

Sorry - I just read you alsways checked the cpu usage. Are all cores at 
100%? Is it the atserisk process which consumes it all?

Am 06.02.2013 13:54, schrieb Thorsten Göllner:
> Did you watch the cpu usage (for example with top)?
> You have a board installed which does use dahdi? Did you check the 
> command "dahdi_test"?
> Maybe a (performance) problem of the software ec?
> Am 06.02.2013 11:13, schrieb Hristo Trendev:
>> Hi,
>> I have been experimenting with ConfBridge from the asterisk-11 stable 
>> SVN branch (and with 11.2.0 also) for the last 3 weeks and I see a 
>> problem, which what I believe is performance related. I just wanted 
>> to ask if someone else has made any tests and what is the maximum 
>> number of participants that they've seen in a conference.
>> I was never able to get more than 8 participants (mixed G722 and 
>> G711a) on a conference (actually that's per server limit) with almost 
>> all settings on default, except for dsp_drop_silence and denoise 
>> which are enabled.
>> I tested on Debian squeeze, 64-bit, quad-core Xeon server @2.4GHz and 
>> also on another virtual server with similar processor (just one core 
>> available to the VM). While this is not the latest and greatest CPU, 
>> I would certainly expect it to handle more than 8 calls.
>> To be honest, I was in fact able to get it working for up to 20 
>> participants (most with G711), when I switched from 
>> res_timing_timerfd to res_timing_dahdi and turned off denoise, but 
>> that's still not normal I believe, especially with most participants 
>> on mute and with dps_drop_silence enabled and nothing else running on 
>> the server.
>> The problem itself is, that once I get over the "critical" number of 
>> participants, the voice starts to break up and it's impossible to 
>> understand the person who's talking. This is certainly not bandwidth 
>> related because all tests were made on the LAN and besides I could 
>> see that the CPU was sometime close to 100%.
>> Did someone observe something similar?
>> BTW, once the first participant enters the conference I start seeing 
>> probably over 50 messages per second saying:
>> bridging.c:757 bridge_channel_join_multithreaded: Going into a 
>> multithreaded waitfor for bridge channel 0x292d708 of bridge 0x28f3658

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