Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b2cbbd8e0e8093fbf115ac2669482b016d781c78
Commit: b2cbbd8e0e8093fbf115ac2669482b016d781c78
Parent: 4c44fd009ae79fc04e2c049f708792ad83400dde
Author: Don Fry <[EMAIL PROTECTED]>
AuthorDate: Mon Mar 5 18:13:09 2007 -0800
Committer: Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Tue Mar 6 06:14:54 2007 -0500
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 <[EMAIL PROTECTED]>
Acked-by: Don Fry <[EMAIL PROTECTED]>
Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
drivers/net/pcnet32.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/pcnet32.c b/drivers/net/pcnet32.c
index 36f9d98..4d94ba7 100644
--- a/drivers/net/pcnet32.c
+++ b/drivers/net/pcnet32.c
@@ -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;
-
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