Merge branch 'tcp-readd-hp'
Florian Westphal says:
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tcp: re-add header prediction
Eric reported a performance regression caused by header prediction
removal.
We now call tcp_ack() much more frequently, for some workloads
this brings in enough cache line misses to become noticeable.
We could possibly still kill HP provided we find a different
way to suppress unneeded tcp_ack, but given we're late in
the cycle it seems preferable to revert.
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Signed-off-by: David S. Miller <davem@davemloft.net>