Merge branch 'tcp-readd-hp'
authorDavid S. Miller <davem@davemloft.net>
Wed, 30 Aug 2017 18:20:09 +0000 (11:20 -0700)
committerDavid S. Miller <davem@davemloft.net>
Wed, 30 Aug 2017 18:20:09 +0000 (11:20 -0700)
commit2c667d40a67a6a49343a75437b5e49d301a07a53
treea4635a632732b39ef560a8f72eb3a81d04f01605
parent0da93d2ebb5d198a4601bd5ad7695f3c6fd36062
parent31770e34e43d6c8dee129bfee77e56c34e61f0e5
Merge branch 'tcp-readd-hp'

Florian Westphal says:

====================
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.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>