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vxge: improve tx performance by using mmiowb() instead of wmb()

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wmb() is extremely heavy on x86.  The semantics required in the driver are
provided by mmiowb(), so use that and improve tx performance on P4 Xeons by
5-10%.

Signed-off-by: Benjamin LaHaise <ben.lahaise@neterion.com>
Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Benjamin LaHaise 2009-08-04 10:21:21 +00:00 committed by David S. Miller
parent ff67df55f6
commit ff1b974cf3
1 changed files with 2 additions and 2 deletions
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4
drivers/net/vxge/vxge-traffic.c
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@ -1070,11 +1070,11 @@ static void __vxge_hw_non_offload_db_post(struct __vxge_hw_fifo *fifo,
VXGE_HW_NODBW_GET_NO_SNOOP(no_snoop),
&fifo->nofl_db->control_0);
wmb();
mmiowb();
writeq(txdl_ptr, &fifo->nofl_db->txdl_ptr);
wmb();
mmiowb();
}
/**