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pcnet32: Fix PCnet32 performance bug on non-coherent architecutres
The PCnet32 driver always passed the the size of the largest possible packet to the pci_dma_sync_single_for_cpu and pci_dma_sync_single_for_device. This results in a fairly large "colateral damage" in the caches and makes the flush operation itself much slower. On a system with a 40MHz CPU this patch increases network bandwidth by about 12%. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Don Fry <pcnet32@verizon.net> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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parent
4c44fd009a
commit
b2cbbd8e0e
1 changed files with 2 additions and 2 deletions
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@ -1234,14 +1234,14 @@ static void pcnet32_rx_entry(struct net_device *dev,
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skb_put(skb, pkt_len); /* Make room */
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skb_put(skb, pkt_len); /* Make room */
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pci_dma_sync_single_for_cpu(lp->pci_dev,
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pci_dma_sync_single_for_cpu(lp->pci_dev,
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lp->rx_dma_addr[entry],
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lp->rx_dma_addr[entry],
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PKT_BUF_SZ - 2,
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pkt_len,
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PCI_DMA_FROMDEVICE);
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PCI_DMA_FROMDEVICE);
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eth_copy_and_sum(skb,
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eth_copy_and_sum(skb,
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(unsigned char *)(lp->rx_skbuff[entry]->data),
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(unsigned char *)(lp->rx_skbuff[entry]->data),
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pkt_len, 0);
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pkt_len, 0);
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pci_dma_sync_single_for_device(lp->pci_dev,
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pci_dma_sync_single_for_device(lp->pci_dev,
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lp->rx_dma_addr[entry],
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lp->rx_dma_addr[entry],
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PKT_BUF_SZ - 2,
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pkt_len,
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PCI_DMA_FROMDEVICE);
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PCI_DMA_FROMDEVICE);
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}
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}
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lp->stats.rx_bytes += skb->len;
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lp->stats.rx_bytes += skb->len;
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