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

Thorsten Göllner tg at ovm-group.com
Fri Feb 8 04:41:35 CST 2013


perhaps it is a problem with your Host-Guest-Setup? Did you try the 
Asterisk-Setup on a dedicated server without virtualization?


Am 07.02.2013 11:42, schrieb Hristo Trendev:
> Hi Thorsten,
> Thanks for your reply. I did check core show translations, but the 
> following 
> http://lists.digium.com/pipermail/asterisk-users/2012-November/276132.html 
> suggests that the values displayed are no longer representing the 
> computation cost only. However to answer your question:
> G722 to SLIN16 cost is 9000, reverse direction is 6000
> ALAW to SLN16 cost is 17000, reverse direction is 14500
> G722 to SLN cost is 9600, reverse direction is 8250
> ALAW to SLN cost is 9000, reverse direction is 6000
> With regards to the CPU usage per core - inside the VM, where only one 
> core is available, the CPU was close to 100% when the problem started 
> to apear, on the physical server with 4 cores, the cores were evenly 
> loaded at about 30-40%. A single call into the conference consumed 
> between 10-20% depending on whether I have denoise enabled or not.
> There is no dahdi board installed, I only use the dahdi module for 
> conference timer (note that the problem is also present with the 
> timerfd timing module).
> BR,
> Hristo
> On Wed, Feb 6, 2013 at 1:57 PM, Thorsten Göllner <tg at ovm-group.com 
> <mailto:tg at ovm-group.com>> wrote:
>     Did you check
>     asterisk -rx "core show translation recalc 10"
>     Am 06.02.2013 13:56, schrieb Thorsten Göllner:
>         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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