> An integral shaper (that can be on or off or tuned dynamically) > --- > is much "tighter" than htb - works on current low end hardware without running out of cpu. See attached graphs. This seems to imply that "tighter" means "uses less CPU". In fact they are two separate benefits; "tighter" means "bursts less". Also, what graphs? As for installing kernel headers, on Debian based distros the right package should be linux-headers-`uname -r` . - Jonathan Morton