diff options
| author | Benjamin LaHaise <ben.lahaise@neterion.com> | 2009-08-04 14:21:57 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-08-06 00:10:45 +0400 |
| commit | ea11bbe0c94b045fdefc05476b69a2eef999a9c4 (patch) | |
| tree | 17e6ba82dbfd3e90f7728fa6b08fb01d1613168b | |
| parent | 3f23e436d241ac1cf50a659228a5a0e1e6572c1a (diff) | |
| download | linux-ea11bbe0c94b045fdefc05476b69a2eef999a9c4.tar.xz | |
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>
| -rw-r--r-- | drivers/net/vxge/vxge-main.c | 6 | ||||
| -rw-r--r-- | drivers/net/vxge/vxge-main.h | 1 |
2 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/vxge/vxge-main.c b/drivers/net/vxge/vxge-main.c index e93651c19f59..094d15548a2b 100644 --- a/drivers/net/vxge/vxge-main.c +++ b/drivers/net/vxge/vxge-main.c @@ -286,6 +286,7 @@ vxge_rx_alloc(void *dtrh, struct vxge_ring *ring, const int skb_size) skb_reserve(skb, VXGE_HW_HEADER_ETHERNET_II_802_3_ALIGN); rx_priv->skb = skb; + rx_priv->skb_data = NULL; rx_priv->data_size = skb_size; vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d Exiting...", ring->ndev->name, __func__, __LINE__); @@ -305,7 +306,8 @@ static int vxge_rx_map(void *dtrh, struct vxge_ring *ring) ring->ndev->name, __func__, __LINE__); rx_priv = vxge_hw_ring_rxd_private_get(dtrh); - dma_addr = pci_map_single(ring->pdev, rx_priv->skb->data, + rx_priv->skb_data = rx_priv->skb->data; + dma_addr = pci_map_single(ring->pdev, rx_priv->skb_data, rx_priv->data_size, PCI_DMA_FROMDEVICE); if (dma_addr == 0) { @@ -450,6 +452,7 @@ vxge_rx_1b_compl(struct __vxge_hw_ring *ringh, void *dtr, skb = rx_priv->skb; data_size = rx_priv->data_size; data_dma = rx_priv->data_dma; + prefetch(rx_priv->skb_data); vxge_debug_rx(VXGE_TRACE, "%s: %s:%d skb = 0x%p", @@ -1056,6 +1059,7 @@ vxge_rx_term(void *dtrh, enum vxge_hw_rxd_state state, void *userdata) rx_priv->data_size, PCI_DMA_FROMDEVICE); dev_kfree_skb(rx_priv->skb); + rx_priv->skb_data = NULL; vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d Exiting...", diff --git a/drivers/net/vxge/vxge-main.h b/drivers/net/vxge/vxge-main.h index 8b3989bc707f..9c36b3a9a63d 100644 --- a/drivers/net/vxge/vxge-main.h +++ b/drivers/net/vxge/vxge-main.h @@ -378,6 +378,7 @@ struct vxgedev { struct vxge_rx_priv { struct sk_buff *skb; + unsigned char *skb_data; dma_addr_t data_dma; dma_addr_t data_size; }; |