diff options
| author | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2006-03-02 18:21:57 -0800 |
|---|---|---|
| committer | root <root@jk-desktop.jf.intel.com> | 2006-03-02 18:21:57 -0800 |
| commit | 30320be88fb9cae888eacf1f1eaae95a03720128 (patch) | |
| tree | 359ba46e6c3d17d1a6fc11b97eea2ad1bc71cca7 | |
| parent | dc7c6add3493cdc71475a006b7afc3732e55abd8 (diff) | |
| download | linux-30320be88fb9cae888eacf1f1eaae95a03720128.tar.gz | |
e1000: Added a performance enhancement - prefetch
- 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>
| -rw-r--r-- | drivers/net/e1000/e1000_main.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c index d641fbc7a6e168..b572a1218c819a 100644 --- a/drivers/net/e1000/e1000_main.c +++ b/drivers/net/e1000/e1000_main.c @@ -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++; @@ -3787,9 +3799,8 @@ 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]))) + 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; |