On Tuesday, February 05, 2013 2:04:12 pm Randall Stewart wrote: > Hmm > > That would trade off a stack pointer + a compare > vs always doing the move.
Right, the store is probably cheaper than the branch. :) However, minimizing the duplicated code in drivers and having this interface be as clear/readable as possible is my main goal. > Thats fine until I have to add the _mc() version, then the put > back would be an atomic, and most of the time the return from > this is probably not changed… > > I really would prefer not to since the compare and maybe store vs > the always store.. though the same now, would be far more expensive > in the _mc version.. if we do a _mc version of course ;-) I would just not bother with an _mc version until we actually need it. :) I think doing the sort of peek/advance type logic only works well with single consumers anyway. -- John Baldwin _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
