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| author |   Eric Dumazet <edumazet@google.com> | 2020-03-24 19:23:21 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-03-25 11:30:40 -0700 |
| commit | 29f3490ba9d2399d3d1b20c4aa74592d92bd4e11 (patch) | |
| tree | 54aab071a4a33ef17587a53e3e9409ae249d6629 /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | cxgb4: remove set but not used variable 'tab' (diff) | |
| download | wireguard-linux-29f3490ba9d2399d3d1b20c4aa74592d92bd4e11.tar.xz wireguard-linux-29f3490ba9d2399d3d1b20c4aa74592d92bd4e11.zip | |
net: use indirect call wrappers for skb_copy_datagram_iter()
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>
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions