diff options
author | Paolo Abeni | 2017-06-21 11:45:31 +0200 |
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committer | David S. Miller | 2017-06-21 11:43:01 -0400 |
commit | 34cfb542b5b1762c73479a4a61e0a3b77253f876 (patch) | |
tree | 0e7db516c60cf9e2b9c306be6b18fc0f50099a2c /security | |
parent | 28b5ba2aa0f55d80adb2624564ed2b170c19519e (diff) |
sock: avoid dirtying incoming_cpu if not needed
for connected socket, the incoming_cpu field in the sock struct
is not going to change frequently, but we are setting it
unconditionally for each packet.
Since sk_incoming_cpu and sk_flags share the same cacheline,
and the latter is access by udp_recvmsg(), this cause a cache
miss for each packet for UDP connected socket.
With this patch, we set the incoming cpu field only when the
ingress cpu really changes.
This gives a small but measurable performance improvement for
connected UDP socket.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions