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authorOlof Johansson <olof@lixom.net>2007-08-22 09:13:03 -0500
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:50:58 -0700
commit02df6cfa09c2ccebe685bfd54a708e1f50b00a81 (patch)
tree77007f4a80ab5aa779d344e22f187af63ddd0f2d /drivers
parent26fcfa95aef980cab4ff1ea55979c30e772dd0dd (diff)
pasemi_mac: Batch up TX buffer frees
Postpone pci unmap and skb free of the transmitted buffers to outside of the tx ring lock, batching them up 32 at a time. Also increase the count threshold to 128. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/pasemi_mac.c39
1 files changed, 29 insertions, 10 deletions
diff --git a/drivers/net/pasemi_mac.c b/drivers/net/pasemi_mac.c
index f71a6864cdc..4836d405cd5 100644
--- a/drivers/net/pasemi_mac.c
+++ b/drivers/net/pasemi_mac.c
@@ -551,37 +551,56 @@ static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
int i;
struct pasemi_mac_buffer *info;
struct pas_dma_xct_descr *dp;
- int start, count;
+ unsigned int start, count, limit;
+ unsigned int total_count;
int flags;
+ struct sk_buff *skbs[32];
+ dma_addr_t dmas[32];
+ total_count = 0;
+restart:
spin_lock_irqsave(&mac->tx->lock, flags);
start = mac->tx->next_to_clean;
+ limit = min(mac->tx->next_to_use, start+32);
+
count = 0;
- for (i = start; i < mac->tx->next_to_use; i++) {
+ for (i = start; i < limit; i++) {
dp = &TX_DESC(mac, i);
+
if (unlikely(dp->mactx & XCT_MACTX_O))
+ /* Not yet transmitted */
break;
- count++;
-
info = &TX_DESC_INFO(mac, i);
-
- pci_unmap_single(mac->dma_pdev, info->dma,
- info->skb->len, PCI_DMA_TODEVICE);
- dev_kfree_skb_irq(info->skb);
+ skbs[count] = info->skb;
+ dmas[count] = info->dma;
info->skb = NULL;
info->dma = 0;
dp->mactx = 0;
dp->ptr = 0;
+
+ count++;
}
mac->tx->next_to_clean += count;
spin_unlock_irqrestore(&mac->tx->lock, flags);
netif_wake_queue(mac->netdev);
- return count;
+ for (i = 0; i < count; i++) {
+ pci_unmap_single(mac->dma_pdev, dmas[i],
+ skbs[i]->len, PCI_DMA_TODEVICE);
+ dev_kfree_skb_irq(skbs[i]);
+ }
+
+ total_count += count;
+
+ /* If the batch was full, try to clean more */
+ if (count == 32)
+ goto restart;
+
+ return total_count;
}
@@ -777,7 +796,7 @@ static int pasemi_mac_open(struct net_device *dev)
PAS_IOB_DMA_RXCH_CFG_CNTTH(0));
write_iob_reg(mac, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
- PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
+ PAS_IOB_DMA_TXCH_CFG_CNTTH(128));
/* Clear out any residual packet count state from firmware */
pasemi_mac_restart_rx_intr(mac);