2013-01-22 [☆] https://plus.google.com/u/0/111049168280159033135/posts/63CBdNN4r4Z
"Plug in a USB keyboard and watch 30% of your cpu get lost to USB. .. given that there are no specs for the USB host controller, Broadcom is making it pretty impossible to fix."
raspberry_pi usb linux broadcom people.gregkh