macvlan: Precise RX stats accounting

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With multi queue devices, its possible that several cpus call
macvlan RX routines simultaneously for the same macvlan device.

We update RX stats counter without any locking, so we can
get slightly wrong counters.

One possible fix is to use percpu counters, to get precise
accounting and also get guarantee of no cache line ping pongs
between cpus.

Note: this adds 16 bytes (32 bytes on 64bit arches) of percpu
data per macvlan device.

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

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Eric Dumazet 2009-11-17 08:53:49 +00:00 • committed by David S. Miller

parent 9793241fe9

commit fccaf71011

1 changed files with 66 additions and 10 deletions

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drivers/net/macvlan.c

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