linux-kernel - [PATCH net-next 0/4] gro: micro-optimize dev_gro

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Date:   Fri, 12 Mar 2021 16:21:49 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>,
        Alexander Lobakin <alobakin@...me>,
        Eric Dumazet <edumazet@...gle.com>,
        Wei Wang <weiwan@...gle.com>,
        Cong Wang <cong.wang@...edance.com>,
        Taehee Yoo <ap420073@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 0/4] gro: micro-optimize dev_gro_receive()

This random series addresses some of suboptimal paths used in
the main GRO entry point.
The main body is patches 3-4 which simplify the code and improve
flow distribution. Two others are mostly cosmetic to make code
more readable.

The benetifs are not so huge and mostly depend on NIC RSS hash
function and a number of Rx flows per single NAPI instance. I got
something like +10-15 Mbps on 4-8 flows NATing.

Alexander Lobakin (4):
  gro: give 'hash' variable in dev_gro_receive() a less confusing name
  gro: don't dereference napi->gro_hash[x] multiple times in
    dev_gro_receive()
  gro: simplify gro_list_prepare()
  gro: improve flow distribution across GRO buckets in dev_gro_receive()

 net/core/dev.c | 31 ++++++++++++++-----------------
 1 file changed, 14 insertions(+), 17 deletions(-)

--
2.30.2