Eric Dumazet 501e7ef569
net-rfs: fix false sharing accessing sd->input_queue_head ...
sd->input_queue_head is incremented for each processed packet
in process_backlog(), and read from other cpus performing
Out Of Order avoidance in get_rps_cpu()
Moving this field in a separate cache line keeps it mostly
hot for the cpu in process_backlog(), as other cpus will
only read it.
In a stress test, process_backlog() was consuming 6.80 % of cpu cycles,
and the patch reduced the cost to 0.65 %
Signed-off-by: Eric Dumazet <edumazet@google.com >
Acked-by: Tom Herbert <tom@herbertland.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
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501e7ef569