Messages in this thread Patch in this message | | | From | Matteo Croce <> | Subject | [PATCH net-next 1/2] mvpp2: prefetch right address | Date | Wed, 9 Jun 2021 15:47:13 +0200 |
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From: Matteo Croce <mcroce@microsoft.com>
In the RX buffer, the received data starts after a headroom used to align the IP header and to allow prepending headers efficiently. The prefetch() should take this into account, and prefetch from the very start of the received data.
We can see that ether_addr_equal_64bits(), which is the first function to access the data, drops from the top of the perf top output.
prefetch(data):
Overhead Shared Object Symbol 11.64% [kernel] [k] eth_type_trans
prefetch(data + MVPP2_MH_SIZE + MVPP2_SKB_HEADROOM):
Overhead Shared Object Symbol 13.42% [kernel] [k] build_skb 10.35% [mvpp2] [k] mvpp2_rx 9.35% [kernel] [k] __netif_receive_skb_core 8.24% [kernel] [k] kmem_cache_free 7.97% [kernel] [k] dev_gro_receive 7.68% [kernel] [k] page_pool_put_page 7.32% [kernel] [k] kmem_cache_alloc 7.09% [mvpp2] [k] mvpp2_bm_pool_put 3.36% [kernel] [k] eth_type_trans
Also, move the eth_type_trans() call a bit down, to give the RAM more time to prefetch the data.
Signed-off-by: Matteo Croce <mcroce@microsoft.com> --- drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c index 5663c1b21870..07d8f3e31b52 100644 --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c @@ -3938,7 +3938,7 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi, goto err_drop_frame; /* Prefetch header */ - prefetch(data); + prefetch(data + MVPP2_MH_SIZE + MVPP2_SKB_HEADROOM); if (bm_pool->frag_size > PAGE_SIZE) frag_size = 0; @@ -4008,8 +4008,8 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi, skb_reserve(skb, MVPP2_MH_SIZE + MVPP2_SKB_HEADROOM); skb_put(skb, rx_bytes); - skb->protocol = eth_type_trans(skb, dev); mvpp2_rx_csum(port, rx_status, skb); + skb->protocol = eth_type_trans(skb, dev); napi_gro_receive(napi, skb); continue; -- 2.31.1
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