From a0c78337dd3a4900bc8628a511131b5a0b1db42a Mon Sep 17 00:00:00 2001 From: Matteo Croce Date: Thu, 24 Oct 2019 19:24:58 +0200 Subject: mvpp2: prefetch frame header 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 Signed-off-by: David S. Miller --- drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c') diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c index c66943219e1b..17e24c1e1c2b 100644 --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c @@ -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; -- cgit v1.2.3-59-g8ed1b