[PATCH] add one parameter wro_enable to enable relaxed ordering for IXGBE

[PATCH] add one parameter wro_enable to enable relaxed ordering for IXGBE

[Mao Wenan]

This patch provides a way to enable relaxed ordering, where it helps with performance in some architecture.
The default value of wro_enable is 0, if you want to enable relaxed ordering, please set wro_enable=1.

Mao Wenan (1):
  add one parameter wro_enable for IXGBE

 drivers/net/ethernet/intel/ixgbe/ixgbe.h        |  1 +
 drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c  | 29 ++++++++++++++-----------
 drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 28 +++++++++++++-----------
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c   |  9 ++++++++
 4 files changed, 41 insertions(+), 26 deletions(-)

-- 
2.5.0

[Intel-wired-lan] [PATCH] add one parameter wro_enable to enable relaxed ordering for IXGBE

[Mao Wenan]

This patch provides a way to enable relaxed ordering, where it helps with performance in some architecture.
The default value of wro_enable is 0, if you want to enable relaxed ordering, please set wro_enable=1.

Mao Wenan (1):
  add one parameter wro_enable for IXGBE

 drivers/net/ethernet/intel/ixgbe/ixgbe.h        |  1 +
 drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c  | 29 ++++++++++++++-----------
 drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 28 +++++++++++++-----------
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c   |  9 ++++++++
 4 files changed, 41 insertions(+), 26 deletions(-)

-- 
2.5.0

[PATCH] add one parameter wro_enable for IXGBE

[Mao Wenan]

---
 drivers/net/ethernet/intel/ixgbe/ixgbe.h        |  1 +
 drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c  | 29 ++++++++++++++-----------
 drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 28 +++++++++++++-----------
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c   |  9 ++++++++
 4 files changed, 41 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index b06e32d..9bc0be5 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -1027,4 +1027,5 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
 				  struct ixgbe_ring *tx_ring);
 u32 ixgbe_rss_indir_tbl_entries(struct ixgbe_adapter *adapter);
 void ixgbe_store_reta(struct ixgbe_adapter *adapter);
+bool ixgbe_wro_enable(void);
 #endif /* _IXGBE_H_ */
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c
index fb51be7..c312aaa 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c
@@ -186,20 +186,23 @@ static s32 ixgbe_start_hw_82598(struct ixgbe_hw *hw)
 	ret_val = ixgbe_start_hw_generic(hw);
 
 #ifndef CONFIG_SPARC
-	/* Disable relaxed ordering */
-	for (i = 0; ((i < hw->mac.max_tx_queues) &&
-	     (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) {
-		regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(i));
-		regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
-		IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(i), regval);
-	}
+	if(likely(!ixgbe_wro_enable())) {
+
+		/* Disable relaxed ordering */
+		for (i = 0; ((i < hw->mac.max_tx_queues) &&
+		     (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) {
+			regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(i));
+			regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
+			IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(i), regval);
+		}
 
-	for (i = 0; ((i < hw->mac.max_rx_queues) &&
-	     (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) {
-		regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i));
-		regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN |
-			    IXGBE_DCA_RXCTRL_HEAD_WRO_EN);
-		IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval);
+		for (i = 0; ((i < hw->mac.max_rx_queues) &&
+		     (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) {
+			regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i));
+			regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN |
+				    IXGBE_DCA_RXCTRL_HEAD_WRO_EN);
+			IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval);
+		}
 	}
 #endif
 	if (ret_val)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
index 77d3039..7115dc0 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
@@ -347,22 +347,24 @@ s32 ixgbe_start_hw_gen2(struct ixgbe_hw *hw)
 	IXGBE_WRITE_FLUSH(hw);
 
 #ifndef CONFIG_SPARC
-	/* Disable relaxed ordering */
-	for (i = 0; i < hw->mac.max_tx_queues; i++) {
-		u32 regval;
-
-		regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL_82599(i));
-		regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
-		IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL_82599(i), regval);
-	}
+	if(likely(!ixgbe_wro_enable())) {
+		/* Disable relaxed ordering */
+		for (i = 0; i < hw->mac.max_tx_queues; i++) {
+			u32 regval;
+
+			regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL_82599(i));
+			regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
+			IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL_82599(i), regval);
+		}
 
-	for (i = 0; i < hw->mac.max_rx_queues; i++) {
-		u32 regval;
+		for (i = 0; i < hw->mac.max_rx_queues; i++) {
+			u32 regval;
 
-		regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i));
-		regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN |
-			    IXGBE_DCA_RXCTRL_HEAD_WRO_EN);
+			regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i));
+			regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN |
+				    IXGBE_DCA_RXCTRL_HEAD_WRO_EN);
 		IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval);
+		}
 	}
 #endif
 	return 0;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index a244d9a..79ebce3 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -171,11 +171,20 @@ static int debug = -1;
 module_param(debug, int, 0);
 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 
+static bool wro_enable = 0;
+module_param(wro_enable, bool, 0);
+MODULE_PARM_DESC(wro_enable, "enable 82599 TX and RX's WRO attribute");
+
 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 MODULE_DESCRIPTION("Intel(R) 10 Gigabit PCI Express Network Driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRV_VERSION);
 
+bool ixgbe_wro_enable(void)
+{
+	return wro_enable;
+}
+
 static struct workqueue_struct *ixgbe_wq;
 
 static bool ixgbe_check_cfg_remove(struct ixgbe_hw *hw, struct pci_dev *pdev);
-- 
2.5.0

[Intel-wired-lan] [PATCH] add one parameter wro_enable for IXGBE

[Mao Wenan]

---
 drivers/net/ethernet/intel/ixgbe/ixgbe.h        |  1 +
 drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c  | 29 ++++++++++++++-----------
 drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 28 +++++++++++++-----------
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c   |  9 ++++++++
 4 files changed, 41 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index b06e32d..9bc0be5 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -1027,4 +1027,5 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
 				  struct ixgbe_ring *tx_ring);
 u32 ixgbe_rss_indir_tbl_entries(struct ixgbe_adapter *adapter);
 void ixgbe_store_reta(struct ixgbe_adapter *adapter);
+bool ixgbe_wro_enable(void);
 #endif /* _IXGBE_H_ */
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c
index fb51be7..c312aaa 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c
@@ -186,20 +186,23 @@ static s32 ixgbe_start_hw_82598(struct ixgbe_hw *hw)
 	ret_val = ixgbe_start_hw_generic(hw);
 
 #ifndef CONFIG_SPARC
-	/* Disable relaxed ordering */
-	for (i = 0; ((i < hw->mac.max_tx_queues) &&
-	     (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) {
-		regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(i));
-		regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
-		IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(i), regval);
-	}
+	if(likely(!ixgbe_wro_enable())) {
+
+		/* Disable relaxed ordering */
+		for (i = 0; ((i < hw->mac.max_tx_queues) &&
+		     (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) {
+			regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL(i));
+			regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
+			IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(i), regval);
+		}
 
-	for (i = 0; ((i < hw->mac.max_rx_queues) &&
-	     (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) {
-		regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i));
-		regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN |
-			    IXGBE_DCA_RXCTRL_HEAD_WRO_EN);
-		IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval);
+		for (i = 0; ((i < hw->mac.max_rx_queues) &&
+		     (i < IXGBE_DCA_MAX_QUEUES_82598)); i++) {
+			regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i));
+			regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN |
+				    IXGBE_DCA_RXCTRL_HEAD_WRO_EN);
+			IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval);
+		}
 	}
 #endif
 	if (ret_val)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
index 77d3039..7115dc0 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
@@ -347,22 +347,24 @@ s32 ixgbe_start_hw_gen2(struct ixgbe_hw *hw)
 	IXGBE_WRITE_FLUSH(hw);
 
 #ifndef CONFIG_SPARC
-	/* Disable relaxed ordering */
-	for (i = 0; i < hw->mac.max_tx_queues; i++) {
-		u32 regval;
-
-		regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL_82599(i));
-		regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
-		IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL_82599(i), regval);
-	}
+	if(likely(!ixgbe_wro_enable())) {
+		/* Disable relaxed ordering */
+		for (i = 0; i < hw->mac.max_tx_queues; i++) {
+			u32 regval;
+
+			regval = IXGBE_READ_REG(hw, IXGBE_DCA_TXCTRL_82599(i));
+			regval &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
+			IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL_82599(i), regval);
+		}
 
-	for (i = 0; i < hw->mac.max_rx_queues; i++) {
-		u32 regval;
+		for (i = 0; i < hw->mac.max_rx_queues; i++) {
+			u32 regval;
 
-		regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i));
-		regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN |
-			    IXGBE_DCA_RXCTRL_HEAD_WRO_EN);
+			regval = IXGBE_READ_REG(hw, IXGBE_DCA_RXCTRL(i));
+			regval &= ~(IXGBE_DCA_RXCTRL_DATA_WRO_EN |
+				    IXGBE_DCA_RXCTRL_HEAD_WRO_EN);
 		IXGBE_WRITE_REG(hw, IXGBE_DCA_RXCTRL(i), regval);
+		}
 	}
 #endif
 	return 0;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index a244d9a..79ebce3 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -171,11 +171,20 @@ static int debug = -1;
 module_param(debug, int, 0);
 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 
+static bool wro_enable = 0;
+module_param(wro_enable, bool, 0);
+MODULE_PARM_DESC(wro_enable, "enable 82599 TX and RX's WRO attribute");
+
 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 MODULE_DESCRIPTION("Intel(R) 10 Gigabit PCI Express Network Driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRV_VERSION);
 
+bool ixgbe_wro_enable(void)
+{
+	return wro_enable;
+}
+
 static struct workqueue_struct *ixgbe_wq;
 
 static bool ixgbe_check_cfg_remove(struct ixgbe_hw *hw, struct pci_dev *pdev);
-- 
2.5.0

Re: [PATCH] add one parameter wro_enable to enable relaxed ordering for IXGBE

[Jeff Kirsher]

[-- Attachment #1: Type: text/plain, Size: 1417 bytes --]

On Sat, 2016-10-29 at 15:08 +0800, Mao Wenan wrote:
> This patch provides a way to enable relaxed ordering, where it helps with
> performance in some architecture.
> The default value of wro_enable is 0, if you want to enable relaxed
> ordering, please set wro_enable=1.
> 
> Mao Wenan (1):
>   add one parameter wro_enable for IXGBE
> 
>  drivers/net/ethernet/intel/ixgbe/ixgbe.h        |  1 +
>  drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c  | 29 ++++++++++++++-----
> ------
>  drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 28 +++++++++++++----
> -------
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c   |  9 ++++++++
>  4 files changed, 41 insertions(+), 26 deletions(-)

Why have a title patch for only one patch?  Better yet, the one patch does
not have a patch description.  Get rid of the title patch and add the above
information into the patches description.

In addition, module parameters are not kindly looked upon, one reason is
that it cannot be standardized and enforced.

I am also confused because you are stating that on some architectures, yet
this code is only compiled in when SPARC is defined and that there are
times when you want relaxed ordering enabled and other times disabled?
 Your gonna have to provide more data on why, because the code as is was
resolving serious performance issues on SPARC when relaxed ordering was
enabled.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

[Intel-wired-lan] [PATCH] add one parameter wro_enable to enable relaxed ordering for IXGBE

[Jeff Kirsher]

On Sat, 2016-10-29 at 15:08 +0800, Mao Wenan wrote:
> This patch provides a way to enable relaxed ordering, where it helps with
> performance in some architecture.
> The default value of wro_enable is 0, if you want to enable relaxed
> ordering, please set wro_enable=1.
> 
> Mao Wenan (1):
> ? add one parameter wro_enable for IXGBE
> 
> ?drivers/net/ethernet/intel/ixgbe/ixgbe.h??????? |? 1 +
> ?drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c? | 29 ++++++++++++++-----
> ------
> ?drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 28 +++++++++++++----
> -------
> ?drivers/net/ethernet/intel/ixgbe/ixgbe_main.c?? |? 9 ++++++++
> ?4 files changed, 41 insertions(+), 26 deletions(-)

Why have a title patch for only one patch? ?Better yet, the one patch does
not have a patch description. ?Get rid of the title patch and add the above
information into the patches description.

In addition, module parameters are not kindly looked upon, one reason is
that it cannot be standardized and enforced.

I am also confused because you are stating that on some architectures, yet
this code is only compiled in when SPARC is defined and that there are
times when you want relaxed ordering enabled and other times disabled?
?Your gonna have to provide more data on why, because the code as is was
resolving serious performance issues on SPARC when relaxed ordering was
enabled.
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答复: [PATCH] add one parameter wro_enable to enable relaxed ordering for IXGBE

[maowenan]

I have verified that the performance will be enhanced certainly when I enabled Relax Ordering on SPARC, but think it is not very flexible to disable or enable Relax Ordering feature using CONFIG_SPARC currently,
So I want to use module parameter to set RO instead of "#ifndef CONFIG_SPARC", no need to rebuild the whole kernel.


-----邮件原件-----
发件人: Jeff Kirsher [mailto:jeffrey.t.kirsher@intel.com] 
发送时间: 2016年10月29日 15:42
收件人: maowenan; intel-wired-lan@lists.osuosl.org; netdev@vger.kernel.org; linux-kernel@vger.kernel.org
主题: Re: [PATCH] add one parameter wro_enable to enable relaxed ordering for IXGBE

On Sat, 2016-10-29 at 15:08 +0800, Mao Wenan wrote:
> This patch provides a way to enable relaxed ordering, where it helps 
> with performance in some architecture.
> The default value of wro_enable is 0, if you want to enable relaxed 
> ordering, please set wro_enable=1.
> 
> Mao Wenan (1):
>   add one parameter wro_enable for IXGBE
> 
>  drivers/net/ethernet/intel/ixgbe/ixgbe.h        |  1 +
>  drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c  | 29 
> ++++++++++++++-----
> ------
>  drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 28 
> +++++++++++++----
> -------
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c   |  9 ++++++++
>  4 files changed, 41 insertions(+), 26 deletions(-)

Why have a title patch for only one patch?  Better yet, the one patch does not have a patch description.  Get rid of the title patch and add the above information into the patches description.

In addition, module parameters are not kindly looked upon, one reason is that it cannot be standardized and enforced.

I am also confused because you are stating that on some architectures, yet this code is only compiled in when SPARC is defined and that there are times when you want relaxed ordering enabled and other times disabled?
 Your gonna have to provide more data on why, because the code as is was resolving serious performance issues on SPARC when relaxed ordering was enabled.

[Intel-wired-lan] 答复: [PATCH] add one parameter wro_enable to enable relaxed ordering for IXGBE

[maowenan]

I have verified that the performance will be enhanced certainly when I enabled Relax Ordering on SPARC, but think it is not very flexible to disable or enable Relax Ordering feature using CONFIG_SPARC currently,
So I want to use module parameter to set RO instead of "#ifndef CONFIG_SPARC", no need to rebuild the whole kernel.


-----????-----
???: Jeff Kirsher [mailto:jeffrey.t.kirsher at intel.com] 
????: 2016?10?29? 15:42
???: maowenan; intel-wired-lan at lists.osuosl.org; netdev at vger.kernel.org; linux-kernel at vger.kernel.org
??: Re: [PATCH] add one parameter wro_enable to enable relaxed ordering for IXGBE

On Sat, 2016-10-29 at 15:08 +0800, Mao Wenan wrote:
> This patch provides a way to enable relaxed ordering, where it helps 
> with performance in some architecture.
> The default value of wro_enable is 0, if you want to enable relaxed 
> ordering, please set wro_enable=1.
> 
> Mao Wenan (1):
> ? add one parameter wro_enable for IXGBE
> 
> ?drivers/net/ethernet/intel/ixgbe/ixgbe.h??????? |? 1 +
> ?drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c? | 29 
> ++++++++++++++-----
> ------
> ?drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 28 
> +++++++++++++----
> -------
> ?drivers/net/ethernet/intel/ixgbe/ixgbe_main.c?? |? 9 ++++++++
> ?4 files changed, 41 insertions(+), 26 deletions(-)

Why have a title patch for only one patch? ?Better yet, the one patch does not have a patch description. ?Get rid of the title patch and add the above information into the patches description.

In addition, module parameters are not kindly looked upon, one reason is that it cannot be standardized and enforced.

I am also confused because you are stating that on some architectures, yet this code is only compiled in when SPARC is defined and that there are times when you want relaxed ordering enabled and other times disabled?
?Your gonna have to provide more data on why, because the code as is was resolving serious performance issues on SPARC when relaxed ordering was enabled.