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author | Eric Dumazet <edumazet@google.com> | 2020-03-24 19:23:21 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-02 08:49:00 +0200 |
commit | f1610480602a475323f9c335540d47b3a95c62fd (patch) | |
tree | a61b7aa1c985ac43bc9c7f6d22e7cd3775a9beb4 /drivers | |
parent | ec9cf8afcd641263bac73a608440a2b22e026a0c (diff) |
net: use indirect call wrappers for skb_copy_datagram_iter()
commit 29f3490ba9d2399d3d1b20c4aa74592d92bd4e11 upstream.
TCP recvmsg() calls skb_copy_datagram_iter(), which
calls an indirect function (cb pointing to simple_copy_to_iter())
for every MSS (fragment) present in the skb.
CONFIG_RETPOLINE=y forces a very expensive operation
that we can avoid thanks to indirect call wrappers.
This patch gives a 13% increase of performance on
a single flow, if the bottleneck is the thread reading
the TCP socket.
Fixes: 950fcaecd5cc ("datagram: consolidate datagram copy to iter helpers")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions