Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ad78af9b authored by Tariq Toukan's avatar Tariq Toukan Committed by Saeed Mahameed
Browse files

net/mlx5e: Use prefetchw when a write is to follow 



"prefetchw()" prefetches the cacheline for write. Use it for
skb->data, as soon we'll be copying the packet header there.

Performance:
Single-stream packet-rate tested with pktgen.
Packets are dropped in tc level to zoom into driver data-path.
Larger gain is expected for smaller packets, as less time
is spent on handling SKB fragments, making the path shorter
and the improvement more significant.

---------------------------------------------
packet size | before    | after     | gain  |
64B         | 4,113,306 | 4,778,720 |  16%  |
1024B       | 3,633,819 | 3,950,593 | 8.7%  |

Signed-off-by: default avatarTariq Toukan <tariqt@mellanox.com>
Cc: kernel-team@fb.com
Signed-off-by: default avatarSaeed Mahameed <saeedm@mellanox.com>
parent 1f5b1e47

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

+1 −1
Original line number Diff line number Diff line
@@ -906,7 +906,7 @@ void mlx5e_handle_rx_cqe_mpwrq(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe) 
		goto mpwrq_cqe_out;

	}



	prefetch(skb->data);

	prefetchw(skb->data);

	cqe_bcnt = mpwrq_get_cqe_byte_cnt(cqe);



	mlx5e_mpwqe_fill_rx_skb(rq, cqe, wi, cqe_bcnt, skb);