netdev - [PATCH net-next v2 00/10] udp/ipv6 optimisations

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Date:   Thu, 27 Jan 2022 00:36:21 +0000
From:   Pavel Begunkov <asml.silence@...il.com>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        linux-kernel@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: [PATCH net-next v2 00/10] udp/ipv6 optimisations

Shed some weight from udp/ipv6. Zerocopy benchmarks over dummy showed
~5% tx/s improvement, should be similar for small payload non-zc
cases.

The performance comes from killing 4 atomics and a couple of big struct
memcpy/memset. 1/10 removes a pair of atomics on dst refcounting for
cork->skb setup, 9/10 saves another pair on cork init. 5/10 and 8/10
kill extra 88B memset and memcpy respectively.

v2: add a comment about setting dst early in ip6_setup_cork()
    drop non-udp patches for now
    add patch 10

Pavel Begunkov (10):
  ipv6: optimise dst refcounting on skb init
  udp6: shuffle up->pending AF_INET bits
  ipv6: remove daddr temp buffer in __ip6_make_skb
  ipv6: clean up cork setup/release
  ipv6: don't zero inet_cork_full::fl after use
  ipv6: pass full cork into __ip6_append_data()
  udp6: pass flow in ip6_make_skb together with cork
  udp6: don't make extra copies of iflow
  ipv6: optimise dst refcounting on cork init
  ipv6: partially inline ipv6_fixup_options

 include/net/ipv6.h    |  14 ++++--
 net/ipv6/exthdrs.c    |   8 ++--
 net/ipv6/ip6_output.c |  99 ++++++++++++++++++++++------------------
 net/ipv6/udp.c        | 103 ++++++++++++++++++++----------------------
 4 files changed, 118 insertions(+), 106 deletions(-)

-- 
2.34.1