I'm trying to diagnose intermittent poor wifi performance on my laptop, which has a fresh installation of 13.04.
I installed several network monitoring tools, including "slurm", which I'm now using to monitor both the wireless interface (wlan0) and the loopback interface (lo). The wireless interface, predictably, shows the same information displayed in the System Monitor; data generally flows at the rate of several hundred KB/second. The loopback interface, however, consistently shows a transaction speed of 5-40 KB/sec, maxing out at around 80-90. I don't really understand how Ubuntu's network interfaces work (plus the complexities of how they interact with Network Manager). Is it normal for the lo interface to be so slow? How does the loopback interface affect networking performance? Can I pretty much ignore it when trying to figure out my wifi problem?