Re: [PATCH 1/5] net: mvneta: increase the 64-bit rx/tx stats out of the hot path

On Sun, 2014-01-12 at 10:31 +0100, Willy Tarreau wrote:

Better count packets and bytes in the stack and on 32 bit then
accumulate them at the end for once. This saves two memory writes
and two memory barriers per packet. The incoming packet rate was
increased by 4.7% on the Openblocks AX3 thanks to this.

Cc: Thomas Petazzoni <redacted>
Cc: Gregory CLEMENT <redacted>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
 drivers/net/ethernet/marvell/mvneta.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

Reviewed-by: Eric Dumazet <edumazet@google.com>

Note that with such a cost, one has to wonder why we keep 64bit stats
for this NIC on 32bit hosts...