[TCP] tcp_cubic: faster cube root
The Newton-Raphson method is quadratically convergent so only a small fixed number of steps are necessary. Therefore it is faster to unroll the loop. Since div64_64 is no longer inline it won't cause code explosion. Also fixes a bug that can occur if x^2 was bigger than 32 bits. Signed-off-by:Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by:
David S. Miller <davem@davemloft.net>
parent
8570419f
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