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rps: avoid one atomic in enqueue_to_backlog
authorEric Dumazet <eric.dumazet@gmail.com>
Thu, 6 May 2010 23:51:21 +0000 (23:51 +0000)
committerDavid S. Miller <davem@davemloft.net>
Tue, 18 May 2010 00:18:50 +0000 (17:18 -0700)
If CONFIG_SMP=y, then we own a queue spinlock, we can avoid the atomic
test_and_set_bit() from napi_schedule_prep().

We now have same number of atomic ops per netif_rx() calls than with
pre-RPS kernel.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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