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authorBenjamin LaHaise <ben.lahaise@neterion.com>2009-08-04 10:21:21 +0000
committerDavid S. Miller <davem@davemloft.net>2009-08-05 13:10:44 -0700
commitff1b974cf30b282f90993ab658e59b73c152c0b8 (patch)
tree688bfaa372fbaa1cf7f7a2e18de970efbfb4c034 /drivers/net/vxge
parentff67df55f6bde9de5e508bf1f09509c843accd54 (diff)
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vxge: improve tx performance by using mmiowb() instead of wmb()
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>
Diffstat (limited to 'drivers/net/vxge')
-rw-r--r--drivers/net/vxge/vxge-traffic.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/vxge/vxge-traffic.c b/drivers/net/vxge/vxge-traffic.c
index c249cd2..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();
}
/**