netdev - [bpf-next PATCH 0/3] XDP micro optimizations for redirect

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Message-ID: <153572913891.27338.14887146010547808356.stgit@firesoul>
Date:   Fri, 31 Aug 2018 17:26:02 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: [bpf-next PATCH 0/3] XDP micro optimizations for redirect

This patchset contains XDP micro optimizations for the redirect core.
These are not functional changes.  The optimizations revolve around
getting the compiler to layout the code in a way that reflect how XDP
redirect is used.

Today the compiler chooses to inline and uninline (static C functions)
in a suboptimal way, compared to how XDP redirect can be used. Perf
top clearly shows that almost everything gets inlined into the
function call xdp_do_redirect.

The way the compiler chooses to inlines, does not reflect how XDP
redirect is used, as the compile cannot know this.

---

Jesper Dangaard Brouer (3):
      xdp: unlikely instrumentation for xdp map redirect
      xdp: explicit inline __xdp_map_lookup_elem
      xdp: split code for map vs non-map redirect

 net/core/filter.c |   64 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 36 insertions(+), 28 deletions(-)

--