net: add a comment on netdev->last_rx

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As some driver authors seem to reintroduce dev->last_rx use,
add a comment to strongly discourage this.

Since commit 6cf3f41e6c (bonding, net: Move last_rx update into bonding
recv logic), network drivers dont need to update last_rx themselves,
unless they use this field to implement a timeout.

Not updating last_rx helps not dirtying a cache line, improving
performance in SMP.

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

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Eric Dumazet 2010-08-31 07:40:16 +00:00 • committed by David S. Miller

parent ba4fd9d828

commit 4dc89133f4

1 changed files with 8 additions and 1 deletions

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include/linux/netdevice.h

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