> but the former does two operations and the latter > only one. your claim was that _xinc is slower > than incref (== lock(), x++, unlock()). but you are > timing xinc+xdec against incref.
sure. i was looking it as a kernel version of a semaphore. back to the original problem, before allocb/freeb did 2 lock/unlocks. now it does 2 unlock/locks + 2 xinc/xdec, and is, in the best case 31% slower. and in the worst case 90% slower. the reference counting is a heavy price to pay on every network block, when it is only used by ip/gre.c. - erik
