netdev - Re: TCP performance regression

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Date:	Mon, 11 Nov 2013 08:44:36 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sujith Manoharan <sujith@...jith.org>
Cc:	Arnaud Ebalard <arno@...isbad.org>, netdev@...r.kernel.org,
	Dave Taht <dave.taht@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: Re: TCP performance regression

On Mon, 2013-11-11 at 06:39 -0800, Eric Dumazet wrote:

> How following patch helps mvneta performance on current net-next tree
> for a single TCP (sending) flow ?
> 

v2 (more chance to even compile ;)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 7d99e695a110..e8211277f15d 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -172,12 +172,12 @@
 /* Various constants */
 
 /* Coalescing */
-#define MVNETA_TXDONE_COAL_PKTS		16
+#define MVNETA_TXDONE_COAL_PKTS		1
 #define MVNETA_RX_COAL_PKTS		32
 #define MVNETA_RX_COAL_USEC		100
 
 /* Timer */
-#define MVNETA_TX_DONE_TIMER_PERIOD	10
+#define MVNETA_TX_DONE_TIMER_PERIOD	1
 
 /* Napi polling weight */
 #define MVNETA_RX_POLL_WEIGHT		64


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