netdev - [PATCH net-next 0/2] tcp: re-add header prediction

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Message-Id: <20170830172458.18544-1-fw@strlen.de>
Date:   Wed, 30 Aug 2017 19:24:56 +0200
From:   Florian Westphal <fw@...len.de>
To:     <netdev@...r.kernel.org>
Cc:     edumazet@...gle.com
Subject: [PATCH net-next 0/2] 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.