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mvpp2: prefetch frame header

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When receiving traffic, eth_type_trans() is high up on the perf top list,
because it's the first function which access the packet data.

Move the DMA unmap a bit higher, and put a prefetch just after it, so we
have more time to load the data into the cache.

The packet rate increase is about 14% with a tc drop test: 1620 => 1853 kpps

Signed-off-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matteo Croce 2019-10-24 19:24:58 +02:00 committed by David S. Miller
parent e1921168bb
commit a0c78337dd
1 changed files with 1 additions and 0 deletions
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drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
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@ -2962,6 +2962,7 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
dma_sync_single_for_cpu(dev->dev.parent, dma_addr,
rx_bytes + MVPP2_MH_SIZE,
DMA_FROM_DEVICE);
prefetch(data);
if (bm_pool->frag_size > PAGE_SIZE)
frag_size = 0;