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tg3: Raise the jumbo frame BD flag threshold 

The current transmit routines set the jumbo frame BD flag too
aggressively.  This can reduce performance for common cases.  This patch
raises the jumbo flag threshold to 1518, up from 1500.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Carlson 2010-12-06 08:28:49 +00:00 committed by David S. Miller
parent ca44ac3861
commit 8fc2f99561
1 changed files with 2 additions and 2 deletions
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4
drivers/net/tg3.c
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@ -5761,7 +5761,7 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb,
dma_unmap_addr_set(&tnapi->tx_buffers[entry], mapping, mapping);
if ((tp->tg3_flags3 & TG3_FLG3_USE_JUMBO_BDFLAG) &&
!mss && skb->len > ETH_DATA_LEN)
!mss && skb->len > VLAN_ETH_FRAME_LEN)
base_flags |= TXD_FLAG_JMB_PKT;
tg3_set_txd(tnapi, entry, mapping, len, base_flags,
@ -5995,7 +5995,7 @@ static netdev_tx_t tg3_start_xmit_dma_bug(struct sk_buff *skb,
#endif
if ((tp->tg3_flags3 & TG3_FLG3_USE_JUMBO_BDFLAG) &&
!mss && skb->len > ETH_DATA_LEN)
!mss && skb->len > VLAN_ETH_FRAME_LEN)
base_flags |= TXD_FLAG_JMB_PKT;
len = skb_headlen(skb);