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| author |   Eric Dumazet <edumazet@google.com> | 2013-07-15 20:03:19 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2013-07-16 12:59:28 -0700 |
| commit | 21d1196a35f5686c4323e42a62fdb4b23b0ab4a3 (patch) | |
| tree | 559c3cf32d2da124090fd6d256948d0d59eeb7e0 /Documentation/ldm.txt | |
| parent | mlx5 core: Fix __udivdi3 when compiling for 32 bit arches (diff) | |
| download | linux-dev-21d1196a35f5686c4323e42a62fdb4b23b0ab4a3.tar.xz linux-dev-21d1196a35f5686c4323e42a62fdb4b23b0ab4a3.zip | |
ipv4: set transport header earlier
commit 45f00f99d6e ("ipv4: tcp: clean up tcp_v4_early_demux()") added a
performance regression for non GRO traffic, basically disabling
IP early demux.
IPv6 stack resets transport header in ip6_rcv() before calling
IP early demux in ip6_rcv_finish(), while IPv4 does this only in
ip_local_deliver_finish(), _after_ IP early demux.
GRO traffic happened to enable IP early demux because transport header
is also set in inet_gro_receive()
Instead of reverting the faulty commit, we can make IPv4/IPv6 behave the
same : transport_header should be set in ip_rcv() instead of
ip_local_deliver_finish()
ip_local_deliver_finish() can also use skb_network_header_len() which is
faster than ip_hdrlen()
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/ldm.txt')
0 files changed, 0 insertions, 0 deletions