On Tue, Mar 07, 2006 at 12:59:17AM +0100, Eric Dumazet wrote:
> I'm not even sure this 'optimization' is valid on UP.
It can be, as branch prediction makes the test essentially free. The real
answer is that it depends on the CPU, how much pressure there is on the write
combining buffers and reorder buffers, etc. Something like this is almost in
the noise when measured on its own, but the combined effect adds up (in this
case netperf throughput increased by ~30%). I'll respin it with the
fast_clear_bit() suggestion.
-ben
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