[App_rpt-users] RaspberryPi Compute Module

[Doug Crompton]

Interesting but I don't think it will differ much in performance from the stock RPi just flexibility. The problem is the USB on the RPi and to some extent also on the BBB but I think the real problem is the app_rpt SW. Many other applications using the same resources  and bandwidths are running on these platforms using USB without the problems I am seeing with app_rpt. App_rpt is old code and in many ways outdated at least in the the IO area. Unless someone does a fairly extensive rewrite of the code I don't think it is going to happen on the Arm processors. There are periodic dropouts using USB (not associated with radio relax) even on PC processors it is just much more pronounced on the arm processors.

When you run an Asterisk PBX on a RPi or BBB the CPU load is nil even when active. As soon as you introduce app_rpt even without radios (pseudo connections) or activity you see 20-30% CPU utilization. While the CPU utilization is not the main problem it sure does not help on a small system. 
I intend to keep plugging away at this but my expectations have been lessened. I am thinking of the possibility of an external USB interface, like Thelinkbox interfaced to asterisk might be a temporary fix. It apparently works well with USB on the ARM. This would also be an inexpensive way to connect remote radios to a server.

If anyone has any ideas on this I would like to hear from you. There are several who have contacted me and perhaps we can form a group working towards a common goal.

73 Doug
WA3DSP
http://www.crompton.com/hamradio


Date: Wed, 9 Apr 2014 07:42:25 +1000
From: edgecomberts at gmail.com
To: app_rpt-users at ohnosec.org
Subject: [App_rpt-users] RaspberryPi Compute Module

Hi list,
Don't know if you had seen this:
http://www.raspberrypi.org/raspberry-pi-compute-module-new-product/


A RaspberryPi with 4GB eMMC in the size of a DDR2-SODIMM. Initial deliveries will be made with the I/O Board, later they will deliver the Compute Module in single quantities.

There is a hard real time Xenomai Linux for RaspberryPi now, it is used with LinuxCNC. Add to this the fact that the GPU was finally open sourced, and if it weren't for that woeful USB performance, it'd be an alright machine.

Doug, you may find this interesting, but as you have mentioned, you have been making better progress with the BeagleBone Black.
Thanks!
Shane.

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