From: willy tarreau <w@xxxxxx> This patch has been added to the 3.12 stable tree. If you have any objections, please let us know. =============== commit dc4277dd41a80fd5f29a90412ea04bc3ba54fbf1 upstream. 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 <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> Cc: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx> Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx> Tested-by: Arnaud Ebalard <arno@xxxxxxxxxxxx> Signed-off-by: Willy Tarreau <w@xxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Jiri Slaby <jslaby@xxxxxxx> --- drivers/net/ethernet/marvell/mvneta.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 834b71d1c668..7553248510ea 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -1391,6 +1391,8 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo, { struct net_device *dev = pp->dev; int rx_done, rx_filled; + u32 rcvd_pkts = 0; + u32 rcvd_bytes = 0; /* Get number of received packets */ rx_done = mvneta_rxq_busy_desc_num_get(pp, rxq); @@ -1428,10 +1430,8 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo, rx_bytes = rx_desc->data_size - (ETH_FCS_LEN + MVNETA_MH_SIZE); - u64_stats_update_begin(&pp->rx_stats.syncp); - pp->rx_stats.packets++; - pp->rx_stats.bytes += rx_bytes; - u64_stats_update_end(&pp->rx_stats.syncp); + rcvd_pkts++; + rcvd_bytes += rx_bytes; /* Linux processing */ skb_reserve(skb, MVNETA_MH_SIZE); @@ -1452,6 +1452,13 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo, } } + if (rcvd_pkts) { + u64_stats_update_begin(&pp->rx_stats.syncp); + pp->rx_stats.packets += rcvd_pkts; + pp->rx_stats.bytes += rcvd_bytes; + u64_stats_update_end(&pp->rx_stats.syncp); + } + /* Update rxq management counters */ mvneta_rxq_desc_num_update(pp, rxq, rx_done, rx_filled); -- 2.3.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html