[Asterisk-Dev] Recent PRI load problem

[Scott Stingel]

Today I've narrowed down the introduction of the PRI problem to between
March 28 and April 4.  Anything more recent than Mar 28 fails my load test,
which produced no errors before March 28, running up to 60 in and out.

I'll try and figure out what exactly is going on and report.  I generate 30
calls simultaneously on one span and receive them on another, and this
generates lots of span failures (D channel down) immediately, and I can get
occasional failures with fewer lines running.

Maybe we should communicate off-line and compare how we do the tests.

Cheers
Scott 


Scott M. Stingel
President,
Emerging Voice Technology, Inc.
Palo Alto California & London England
www.evtmedia.com 

-----Original Message-----
From: asterisk-dev-admin at lists.digium.com
[mailto:asterisk-dev-admin at lists.digium.com] On Behalf Of John James
Sent: Friday, May 14, 2004 12:41 PM
To: asterisk-dev at lists.digium.com
Subject: RE: [Asterisk-Dev] Recent PRI load problem

I pulled a copy from CVS on 4/30 and haven't had a problem.  I loaded up
18 channels of a PRI and held the connections open for several minutes.
The method I used was to dial out and back in 9 times via the pstn.

John James


-----Original Message-----
From: asterisk-dev-admin at lists.digium.com
[mailto:asterisk-dev-admin at lists.digium.com] On Behalf Of reseaux
Sent: Friday, May 14, 2004 3:00 AM
To: asterisk-dev at lists.digium.com
Subject: Re: [Asterisk-Dev] Recent PRI load problem

Dear Scott
	i have the same problem with my E100P and mt Lucent pbx..
Thanks in advance
Dimitri

On Thursday 13 May 2004 07:19 pm, Scott Stingel wrote:
> Hello-
>
> I attempted last week to update to the latest CVS for my customer in 
> Portugal, in order to take advantage of some new available features.
(I
> have 5 systems running high-volume IVR, each with 4 E1 spans).
>
> In this process, I found that since March 25 (when I last had a
version
> that passed any kind of load test), the PRI driver or related code has
been
> changed, with the result that it can no longer handle load without 
> constantly taking the PRI D-channels down and up.  This of course
results
> in many lost calls.  I can make this happen with my load tester quite 
> easily - it only takes 10 or more simultaneous PRI calls, and happens 
> within 60 seconds.
>
> The first error I get is:
>
> May 13 09:59:02 WARNING[-1200182352]: chan_zap.c:6134 zt_pri_error:
PRI:
> ACK received outside of window, restarting
>   == D-Channel on span 2 down
>
> Followed by many I-frame and S-frame errors that result from the link
being
> down.
>
> I'm trying to narrow down the date and changes made to the chan_zap
and
> related code during April so that I can zero in on the error or bug.
If
> anyone has changed the PRI driver code recently (April probably),
could you
> please contact me or post here for discussion?  I'm trying to gather
more
> info before posting this on the bug list.
>
> Thanks!
> Scott Stingel
>
> PS:  My load tester loops back a designated number of channels on PRI
2 to
> PRI 1, and PRI 4 to PRI 3.  It generates calls on channels on the even
PRI
> spans and receives them on the odd spans.  The receiving dialplan
simply
> answers, plays a message and hangs up.  I have used this software and 
> loopback configuration successfully for about a year now in helping to 
> flush out bugs and limitations of the drivers and hardware.
>
>
>
>
> Scott M. Stingel
> President,
> Emerging Voice Technology, Inc.
> Palo Alto California & London England
> www.evtmedia.com
>
>
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