netdev - [PATCH 17/27] e1000e: 82574/82583 performance improvement

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Date:	Fri, 10 Dec 2010 22:19:04 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Bruce Allan <bruce.w.allan@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, bphilips@...ell.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [PATCH 17/27] e1000e: 82574/82583 performance improvement

From: Bruce Allan <bruce.w.allan@...el.com>

Increasing the transmit fifo by 4K (by decreasing the receive fifo size
specified in .pba by the same amount) increases Tx performance.

Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
Tested-by: Emil Tantilov <emil.s.tantilov@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/e1000e/82571.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/e1000e/82571.c b/drivers/net/e1000e/82571.c
index 6942e2f..280d41f 100644
--- a/drivers/net/e1000e/82571.c
+++ b/drivers/net/e1000e/82571.c
@@ -2005,7 +2005,7 @@ struct e1000_info e1000_82574_info = {
 				  | FLAG_HAS_AMT
 				  | FLAG_HAS_CTRLEXT_ON_LOAD,
 	.flags2			  = FLAG2_CHECK_PHY_HANG,
-	.pba			= 36,
+	.pba			= 32,
 	.max_hw_frame_size	= DEFAULT_JUMBO,
 	.get_variants		= e1000_get_variants_82571,
 	.mac_ops		= &e82571_mac_ops,
@@ -2022,7 +2022,7 @@ struct e1000_info e1000_82583_info = {
 				  | FLAG_HAS_SMART_POWER_DOWN
 				  | FLAG_HAS_AMT
 				  | FLAG_HAS_CTRLEXT_ON_LOAD,
-	.pba			= 36,
+	.pba			= 32,
 	.max_hw_frame_size	= ETH_FRAME_LEN + ETH_FCS_LEN,
 	.get_variants		= e1000_get_variants_82571,
 	.mac_ops		= &e82571_mac_ops,
-- 
1.7.3.2

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