[asterisk-users] CPU spike

[Brandon Shults]

Can you duplicate the problem with Chan_sip?

I know it would be a pain to switch from PJ to chan, but it might shed some
light on narrowing down the problem.



On Wed, May 5, 2021, 8:47 AM Dan Cropp <dan at amtelco.com> wrote:

> Running Asterisk 16.17.0
>
>
>
> We have an interesting scenario where we see Asterisk CPU usage spike to
> the point the entire system is maxed out.
>
>
>
> There is a specific scenario where we have two ConfBridges and they are
> connected via a local channel.  Everything is fine here.
>
>
>
> Callers <-> ConfBridge A <-> local channel <-> ConfBridge B <-> Callers
>
>
>
> We may be recording both ConfBridges for different groups.  Again, all is
> fine.
>
>
>
> Where we run into a problem is when someone decides they need to record a
> response.  We connect another local channel to the ConfBridge.  All is fine.
>
> Callers <-> ConfBridge A <-> local channel <-> ConfBridge B <-> Callers
>
>
> <-> Local Channel
>
>
>
> Then, we initiate a record on the other end of the local channel.
>
> Callers <-> ConfBridge A <-> local channel <-> ConfBridge B <-> Callers
>
>
> <-> Local Channel (start recording)
>
>
>
> Suddenly, the CPU usage spikes to the point the system is starving and
> gradually gets worse.
>
> Looking at the debug log for Asterisk, we are seeing thousands of messages
> like this (roughly 8-10 sets every millisecond)
>
> [05/05 10:25:28.541] DEBUG[2981][C-00000038] chan_pjsip.c:
> PJSIP/1003-00000007: Indicated Video Update
>
> [05/05 10:25:28.541] DEBUG[2981][C-00000038] chan_pjsip.c:
> PJSIP/1003-00000007
>
> [05/05 10:25:28.541] DEBUG[2981][C-00000038] chan_pjsip.c:
> PJSIP/1003-00000007: Indicated Video Update
>
> [05/05 10:25:28.541] DEBUG[2981][C-00000038] chan_pjsip.c:
> PJSIP/1003-00000007
>
> [05/05 10:25:28.541] DEBUG[2981][C-00000038] chan_pjsip.c:
> PJSIP/1003-00000007: Indicated Video Update
>
> [05/05 10:25:28.541] DEBUG[2981][C-00000038] chan_pjsip.c:
> PJSIP/1003-00000007
>
> [05/05 10:25:28.541] DEBUG[2981][C-00000038] chan_pjsip.c:
> PJSIP/1003-00000007: Indicated Video Update
>
>
>
> After this occurs, the messages in the debug output can also be a bit out
> of order for the date/time listed in the file.
>
>
>
> An interesting scenario, if we first start recording on the Local channel,
> then add it to the ConfBridge this CPU spike does not occur.
>
>
>
> We realize this is a bit of an extreme scenario, two ConfBridges connected
> with a local channel, and needing to connect another local channel to one
> of the ConfBridges and start recording.  Unfortunately, it’s a scenario we
> are stuck with due to a unique customer requirement.
>
>
>
> Any thoughts or suggestions?
>
>
>
> Dan
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