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[Discuss-gnuradio] U's and L's when running GNU Radio

From: khalid.el-darymli
Subject: [Discuss-gnuradio] U's and L's when running GNU Radio
Date: Mon, 5 Jan 2015 13:19:08 -0330


In the terminal and while using a powerful PC (please see the attachment), I am occasionally getting capital U's and L's when running GNU Radio with one Tx and 4 Rx channels (Here is a sample of what I am getting: ULLLLLLLLLLLLLLLULLLLULLLLLLLLLLLLLLLULLLULLLLLLLLLLLLLLLLLLLLLLLLLLLL).

Please note that I am using timed-commands to start both the Tx and Rx's at the same time. When I check the System Monitor while GNU Radio is running (please see the attachment), the CPU history and RAM usage seem to be fine. Also, swap memory is disabled as shown in the attachment. What causes  this issue and how to handle it? Could it be due to some instability in the writing speed to the hard drive?

BTW, I am having the same issue for my older PC (a PC with less specs). The System Monitor tells me that my CPU usage is around 60% and my RAM usage is around 45%, however, I am getting U's and L's when I try to use four Rx channels. Please note that the system doesn't throw lots of U's and L's at once, it is a kind of frequent where a bunch of them are thrown out every many seconds or so.

Thanks in advance for your help.

Best regards,

Attachment: SystemMonitor.png
Description: PNG image

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