linux-kernel - [PATCH net-next 2/3] net: mvpp2: adjust gso stop wake thresholds

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Message-Id: <20180226141427.31536-2-antoine.tenart@bootlin.com>
Date:   Mon, 26 Feb 2018 15:14:26 +0100
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     davem@...emloft.net
Cc:     Yan Markman <ymarkman@...vell.com>, mw@...ihalf.com,
        stefanc@...vell.com, thomas.petazzoni@...e-electrons.com,
        gregory.clement@...e-electrons.com,
        miquel.raynal@...e-electrons.com, nadavh@...vell.com,
        maxime.chevallier@...tlin.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/3] net: mvpp2: adjust gso stop wake thresholds

From: Yan Markman <ymarkman@...vell.com>

Adjust MVPP2_MAX_TSO_SEGS and stop_threshold/wake_threshold
for better TXQ utilization and performance.

Signed-off-by: Yan Markman <ymarkman@...vell.com>
---
 drivers/net/ethernet/marvell/mvpp2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c
index 55300b1fe6c0..1a893ef70eab 100644
--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -498,7 +498,7 @@
  * skb. As we need a maxium of two descriptors per fragments (1 header, 1 data),
  * multiply this value by two to count the maximum number of skb descs needed.
  */
-#define MVPP2_MAX_TSO_SEGS		300
+#define MVPP2_MAX_TSO_SEGS		100
 #define MVPP2_MAX_SKB_DESCS		(MVPP2_MAX_TSO_SEGS * 2 + MAX_SKB_FRAGS)
 
 /* Dfault number of RXQs in use */
@@ -5810,7 +5810,7 @@ static int mvpp2_txq_init(struct mvpp2_port *port,
 		txq_pcpu->tso_headers = NULL;
 
 		txq_pcpu->stop_threshold = txq->size - MVPP2_MAX_SKB_DESCS;
-		txq_pcpu->wake_threshold = txq_pcpu->stop_threshold / 2;
+		txq_pcpu->wake_threshold = txq_pcpu->stop_threshold - 100;
 
 		txq_pcpu->tso_headers =
 			dma_alloc_coherent(port->dev->dev.parent,
-- 
2.14.3