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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>
This commit is contained in:
Don Fry 2007-03-05 18:13:09 -08:00 committed by Jeff Garzik
parent 4c44fd009a
commit b2cbbd8e0e
1 changed files with 2 additions and 2 deletions
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4
drivers/net/pcnet32.c
View File

@ -1234,14 +1234,14 @@ static void pcnet32_rx_entry(struct net_device *dev,
skb_put(skb, pkt_len); /* Make room */
pci_dma_sync_single_for_cpu(lp->pci_dev,
lp->rx_dma_addr[entry],
PKT_BUF_SZ - 2,
pkt_len,
PCI_DMA_FROMDEVICE);
eth_copy_and_sum(skb,
(unsigned char *)(lp->rx_skbuff[entry]->data),
pkt_len, 0);
pci_dma_sync_single_for_device(lp->pci_dev,
lp->rx_dma_addr[entry],
PKT_BUF_SZ - 2,
pkt_len,
PCI_DMA_FROMDEVICE);
}
lp->stats.rx_bytes += skb->len;