I'm running Xubuntu 13.10 "Saucy Salamander." It's a pretty recent install. I'm playing music over a bluetooth usb dongle on a home theater system. All of my sound goes through pulseaudio.
I've found that downloading files kills my sound -- it starts to stutter and lag to the point that it's pretty much unrecognizable. It's almost bearable around 200 KB/s but unusuable around 1-2 MB/s. My hard drive has a speed of 7200 RPM, so it seems unlikely to be an issue with the drive.
What's going wrong here? Is this just an issue with the linux disk scheduler? Do I need to patch my kernel with BFQ to fix it, or is there an easier way?