vxge: prefetch skb->data
This patch implements prefetching of skb->data from a copy of the pointer in the descriptor (which is already in the L1 cache at this point). This improves netperf rx performance (netperf -L 0,0 -c -H 192.168.254.2 -- -M 131072 -m 131072) by 4.9% on a P4 Xeon host. Signed-off-by: Benjamin LaHaise <ben.lahaise@neterion.com> Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com> Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -286,6 +286,7 @@ vxge_rx_alloc(void *dtrh, struct vxge_ring *ring, const int skb_size)
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skb_reserve(skb, VXGE_HW_HEADER_ETHERNET_II_802_3_ALIGN);
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rx_priv->skb = skb;
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rx_priv->skb_data = NULL;
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rx_priv->data_size = skb_size;
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vxge_debug_entryexit(VXGE_TRACE,
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"%s: %s:%d Exiting...", ring->ndev->name, __func__, __LINE__);
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@ -305,7 +306,8 @@ static int vxge_rx_map(void *dtrh, struct vxge_ring *ring)
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ring->ndev->name, __func__, __LINE__);
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rx_priv = vxge_hw_ring_rxd_private_get(dtrh);
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dma_addr = pci_map_single(ring->pdev, rx_priv->skb->data,
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rx_priv->skb_data = rx_priv->skb->data;
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dma_addr = pci_map_single(ring->pdev, rx_priv->skb_data,
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rx_priv->data_size, PCI_DMA_FROMDEVICE);
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if (dma_addr == 0) {
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@ -450,6 +452,7 @@ vxge_rx_1b_compl(struct __vxge_hw_ring *ringh, void *dtr,
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skb = rx_priv->skb;
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data_size = rx_priv->data_size;
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data_dma = rx_priv->data_dma;
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prefetch(rx_priv->skb_data);
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vxge_debug_rx(VXGE_TRACE,
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"%s: %s:%d skb = 0x%p",
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@ -1056,6 +1059,7 @@ vxge_rx_term(void *dtrh, enum vxge_hw_rxd_state state, void *userdata)
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rx_priv->data_size, PCI_DMA_FROMDEVICE);
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dev_kfree_skb(rx_priv->skb);
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rx_priv->skb_data = NULL;
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vxge_debug_entryexit(VXGE_TRACE,
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"%s: %s:%d Exiting...",
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@ -378,6 +378,7 @@ struct vxgedev {
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struct vxge_rx_priv {
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struct sk_buff *skb;
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unsigned char *skb_data;
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dma_addr_t data_dma;
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dma_addr_t data_size;
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};
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