[App_rpt-users] DIAL 8.5 and VM's on ProxMox

[David McGough]

Hi,

You should strive for better timing numbers for serious use. AllStar uses
the dahdi bridge/conference software as the mechanism to mix all the
received audio for a given node into the combined transmit audio....Every
time that you link nodes together, you're dynamically creating a dahdi
multi-party bridge, which is similar to an Asterisk conference call
"underneath the covers."  The software timing must be spot-on to
accomplish this task without glitches.

Here may be a couple links of interest:

https://community.freepbx.org/t/this-is-scaring-the-hell-out-of-me/11389
https://wiki.asterisk.org/wiki/display/AST/Bridges


73, David KB4FXC





On Tue, 28 Nov 2017, Benjamin Naber wrote:

> David,

you message was put in my "Worthy Keeping" folder!

While on this subject, are there any other tests?

These were the results of: dahdi_test -c 100

me at KB9LFZ-2:~# dahdi_test -c 100
Opened pseudo dahdi interface, measuring accuracy...
99.999% 99.997% 99.609% 99.997% 99.998% 99.615% 99.995% 99.608%Â 
99.999% 99.615% 99.608% 99.613% 99.608% 99.999% 99.994% 99.970%Â 
99.645% 99.998% 99.608% 99.998% 99.996% 99.996% 99.998% 99.996%Â 
99.998% 99.996% 99.999% 99.615% 99.611% 99.613% 99.995% 99.608%Â 
99.997% 99.612% 99.608% 99.614% 99.608% 99.615% 99.997% 100.000%Â 
99.605% 99.612% 99.989% 99.976% 99.957% 99.998% 99.996% 99.997%Â 
100.000% 99.993% 99.998% 99.997% 99.999% 99.997% 99.997% 99.997%Â 
99.997% 99.998% 99.998% 99.996% 99.999% 99.993% 99.999% 99.999%Â 
99.993% 99.998% 99.998% 99.998% 99.997% 99.994% 99.999% 99.997%Â 
99.999% 99.998% 99.993% 100.000% 99.997% 100.000% 99.996% 99.997%Â 
99.998% 99.995% 99.998% 99.999% 99.992% 99.999% 99.997% 99.998%Â 
99.998% 99.996% 99.997% 99.999% 99.996% 99.999% 99.996% 99.997%Â 
99.997% 99.995%Â 
--- Results after 98 passes ---
Best: 100.000% -- Worst: 99.605% -- Average: 99.917708%
Cummulative Accuracy (not per pass): 99.997

What is interesting about this mess is that Windows 10 does not do very
well on this enviroment... while the Linux machines just seem to work
as if the OS was installed on real hardware

~Benjamin, KB9LFZ




On Mon, 2017-11-27 at 22:07 -0500, David McGough wrote:
> 
> To REALLY tell how well any environment is working, you need to check
> the
> timing quality as reported from the dahdi kernel drivers. Many
> environments (particularly VPS!) do rather poorly in the area. Poor
> results typically mean audio choppiness and poor telemetry timing
> (e.g.:Â Â 
> Bad CW or tone timing), particularly where the server is used as a
> hub
> with many users connecting, needing to mix many audio streams. Note
> that
> this is an asterisk thing, not specifically AllStar. Many messages
> have
> been written about this in other asterisk related forums; goog'ling
> will
> find many results.
> 
> To test the timing quality, use the dahdi_test command. Jitter in the
> timing results and accuracy less than about 99.8% means less than
> perfect
> performance and potentially mediocre results.
> 
> Here is a sample run from my dev RPi3 system with 3 nodes (2 usb
> audio, 1Â 
> pseudo) active:
> 
> [root at alarmpi-kb4fxc asterisk]# dahdi_test -c 100
> Opened pseudo dahdi interface, measuring accuracy...
> 99.992% 99.990% 99.994% 99.994% 99.995% 99.996% 99.994% 99.994%Â 
> 99.995% 99.993% 99.996% 99.994% 99.994% 99.994% 99.995% 99.996%Â 
> 99.993% 99.993% 99.994% 99.995% 99.995% 99.994% 99.994% 99.994%Â 
> 99.994% 99.995% 99.993% 99.994% 99.994% 99.994% 99.995% 99.993%Â 
> 99.994% 99.993% 99.994% 99.995% 99.993% 99.994% 99.994% 99.994%Â 
> 99.996% 99.993% 99.994% 99.994% 99.995% 99.996% 99.994% 99.994%Â 
> 99.994% 99.994% 99.996% 99.994% 99.994% 99.993% 99.994% 99.995%Â 
> 99.995% 99.993% 99.994% 99.995% 99.995% 99.995% 99.994% 99.994%Â 
> 99.994% 99.994% 99.994% 99.994% 99.994% 99.995% 99.995% 99.994%Â 
> 99.994% 99.993% 99.994% 99.996% 99.993% 99.995% 99.994% 99.995%Â 
> 99.996% 99.993% 99.994% 99.994% 99.995% 99.996% 99.994% 99.994%Â 
> 99.994% 99.994% 99.996% 99.994% 99.994% 99.995% 99.994% 99.996%Â 
> 99.994% 99.993%Â 
> --- Results after 98 passes ---
> Best: 99.996% -- Worst: 99.990% -- Average: 99.994247%
> Cummulative Accuracy (not per pass): 99.994
> 
> 
> 73, David KB4FXC
> 
> 
> On Mon, 27 Nov 2017, Benjamin Naber wrote:
> 
> > For those of you who are into this sort of thing, DIAL 8.5 has been
> 
> installed, conbooberated and running successfully with no apparent
> lag,
> on the latest stable version of Proxmox. Currently, it is a radio-
> less
> node.
> 
> The test environment is a cluster of three Dell R310 servers (nodes),
> each with 16GB+ RAM, RAID 1 system drives, some other volume drives,
> 10GB fiber storage network links, and 1GB network connections.
> 
> Each of three nodes have other VMs running on them, running stuff
> like
> BIONIC, and other silly things for 'stress' testing, as the system is
> being evaluated for production environment.
> 
> To my understanding, proxmox is not a load-sharing/proxy/cloud
> computing network, each VM is hosted/homed on a single node, but has
> "live" versions on the other nodes in the cluster. Should a node
> suffer
> both power supply failures, or CPU fan squeals to a stop, or the RAID
> controller dies, within a minute or so, another node will spin up the
> live versions of the VMs that were on the now dead node.
> 
> So far, that has not been any noticeable lag, jitters, delay,
> otherwise
> anything negative, much to my surprise. This is a 101 for me on VM
> stuff, never messed with it until now.
> 
> If anyone wants to assist in testing, you are invited to connect to
> 29567
> Tuesday night, 7PM Central/8PM Eastern for our weekly Allstar
> Technical
> Net.
> 
> I am calling the net tomorrow night, to which the topics are advanced
> ASL node configurations, and some other stuff I have to be reminded
> of.
> 
> There is chatter throughout the days, more-so at night, so anyone is
> welcome to connect anytime!
> 
> 
> Don't be a square, connect to there!
> 
> ~Benjamin, KB9LFZ
> 
> 
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