On 6 May 2014 03:13, yan cui <ccuiyyan@gmail.com> wrote:

Instead of digging much into the kernel code, I post the question here. Does the speed come from its good design or insufficient kernel support?

it's a bit of both: the compiler suite is much faster; the kernel source is less than the size of their include files; old drivers and obsolete code is eventually discarded; and it would be fair to say that device support is more limited, certainly compared to Linux.