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e1000: Added a performance enhancement - prefetch

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- this implementation of prefetch was tested on new and old hardware

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
This commit is contained in:
Jeff Kirsher 2006-03-02 18:21:57 -08:00 committed by root
parent dc7c6add34
commit 30320be88f
1 changed files with 15 additions and 3 deletions
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16
drivers/net/e1000/e1000_main.c
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@ -3569,10 +3569,15 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter,
skb = buffer_info->skb;
buffer_info->skb = NULL;
prefetch(skb->data - NET_IP_ALIGN);
if (++i == rx_ring->count) i = 0;
next_rxd = E1000_RX_DESC(*rx_ring, i);
prefetch(next_rxd);
next_buffer = &rx_ring->buffer_info[i];
next_skb = next_buffer->skb;
prefetch(next_skb->data - NET_IP_ALIGN);
cleaned = TRUE;
cleaned_count++;
@ -3668,6 +3673,7 @@ next_desc:
cleaned_count = 0;
}
/* use prefetched values */
rx_desc = next_rxd;
buffer_info = next_buffer;
}
@ -3710,9 +3716,9 @@ e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,
i = rx_ring->next_to_clean;
rx_desc = E1000_RX_DESC_PS(*rx_ring, i);
staterr = le32_to_cpu(rx_desc->wb.middle.status_error);
buffer_info = &rx_ring->buffer_info[i];
while (staterr & E1000_RXD_STAT_DD) {
buffer_info = &rx_ring->buffer_info[i];
ps_page = &rx_ring->ps_page[i];
ps_page_dma = &rx_ring->ps_page_dma[i];
#ifdef CONFIG_E1000_NAPI
@ -3722,10 +3728,16 @@ e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,
#endif
skb = buffer_info->skb;
/* in the packet split case this is header only */
prefetch(skb->data - NET_IP_ALIGN);
if (++i == rx_ring->count) i = 0;
next_rxd = E1000_RX_DESC_PS(*rx_ring, i);
prefetch(next_rxd);
next_buffer = &rx_ring->buffer_info[i];
next_skb = next_buffer->skb;
prefetch(next_skb->data - NET_IP_ALIGN);
cleaned = TRUE;
cleaned_count++;
@ -3789,7 +3801,6 @@ e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,
for (j = 0; j < adapter->rx_ps_pages; j++) {
if (!(length= le16_to_cpu(rx_desc->wb.upper.length[j])))
break;
pci_unmap_page(pdev, ps_page_dma->ps_page_dma[j],
PAGE_SIZE, PCI_DMA_FROMDEVICE);
ps_page_dma->ps_page_dma[j] = 0;
@ -3837,6 +3848,7 @@ next_desc:
cleaned_count = 0;
}
/* use prefetched values */
rx_desc = next_rxd;
buffer_info = next_buffer;