* [3/6] vxge: improve tx performance by using mmiowb() instead of wmb()
@ 2009-08-04 20:21 Benjamin LaHaise
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From: Benjamin LaHaise @ 2009-08-04 20:21 UTC (permalink / raw)
To: netdev
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>
---
diff --git a/drivers/net/vxge/vxge-traffic.c b/drivers/net/vxge/vxge-traffic.c
index 370f55c..0efb769 100644
--- a/drivers/net/vxge/vxge-traffic.c
+++ b/drivers/net/vxge/vxge-traffic.c
@@ -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();
}
/**
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2009-08-04 20:21 [3/6] vxge: improve tx performance by using mmiowb() instead of wmb() Benjamin LaHaise
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