diff options
| author |   Tariq Toukan <tariqt@mellanox.com> | 2017-02-15 17:05:39 +0200 |
|---|---|---|
| committer |   Saeed Mahameed <saeedm@mellanox.com> | 2017-04-30 16:03:17 +0300 |
| commit | ad78af9b88f3d12134d6406468e7798e65c385c0 (patch) | |
| tree | 770ea9521b351d2277cea39662492d64d0be7156 /drivers/net | |
| parent | net/mlx5e: Optimize poll ICOSQ completion queue (diff) | |
| download | linux-dev-ad78af9b88f3d12134d6406468e7798e65c385c0.tar.xz linux-dev-ad78af9b88f3d12134d6406468e7798e65c385c0.zip | |
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: Tariq Toukan <tariqt@mellanox.com>
Cc: kernel-team@fb.com
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c index d717573b73da..7b1566f0ae58 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c @@ -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); |