netdev - [PATCH -next 3/6] bnx2: Adjust flow control water marks.

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Message-ID: <1266298932-28129-3-git-send-email-mchan@broadcom.com>
Date:	Mon, 15 Feb 2010 21:42:09 -0800
From:	"Michael Chan" <mchan@...adcom.com>
To:	davem@...emloft.net
cc:	netdev@...r.kernel.org
Subject: [PATCH -next 3/6] bnx2: Adjust flow control water marks.

The current water marks are too high and can cause unnecessary flow
control frames.

Signed-off-by: Michael Chan <mchan@...adcom.com>
Signed-off-by: Benjamin Li <benli@...adcom.com>
---
 drivers/net/bnx2.c |    2 +-
 drivers/net/bnx2.h |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 063f283..54d43d8 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -1277,7 +1277,7 @@ bnx2_init_rx_context(struct bnx2 *bp, u32 cid)
 		if (lo_water >= bp->rx_ring_size)
 			lo_water = 0;
 
-		hi_water = bp->rx_ring_size / 4;
+		hi_water = min_t(int, bp->rx_ring_size / 4, lo_water + 16);
 
 		if (hi_water <= lo_water)
 			lo_water = 0;
diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index b860fbb..cd4b0e4 100644
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -349,7 +349,7 @@ struct l2_fhdr {
 #define BNX2_L2CTX_BD_PRE_READ				0x00000000
 #define BNX2_L2CTX_CTX_SIZE				0x00000000
 #define BNX2_L2CTX_CTX_TYPE				0x00000000
-#define BNX2_L2CTX_LO_WATER_MARK_DEFAULT		 32
+#define BNX2_L2CTX_LO_WATER_MARK_DEFAULT		 4
 #define BNX2_L2CTX_LO_WATER_MARK_SCALE			 4
 #define BNX2_L2CTX_LO_WATER_MARK_DIS			 0
 #define BNX2_L2CTX_HI_WATER_MARK_SHIFT			 4
-- 
1.6.4.GIT


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