netdev - [PATCH net-next v2 6/7] net: axienet: reduce default RX interrupt threshold to 1

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Message-Id: <20220305002305.1710462-7-robert.hancock@calian.com>
Date:   Fri,  4 Mar 2022 18:23:04 -0600
From:   Robert Hancock <robert.hancock@...ian.com>
To:     netdev@...r.kernel.org
Cc:     radhey.shyam.pandey@...inx.com, davem@...emloft.net,
        kuba@...nel.org, michal.simek@...inx.com, linux@...linux.org.uk,
        daniel@...earbox.net, linux-arm-kernel@...ts.infradead.org,
        Robert Hancock <robert.hancock@...ian.com>
Subject: [PATCH net-next v2 6/7] net: axienet: reduce default RX interrupt threshold to 1

Now that NAPI has been implemented, the hardware interrupt mitigation
mechanism is not needed to avoid excessive interrupt load in most cases.
Reduce the default RX interrupt threshold to 1 to reduce introduced
latency. This can be increased with ethtool if desired if some applications
still want to reduce interrupts.

Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
---
 drivers/net/ethernet/xilinx/xilinx_axienet.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h b/drivers/net/ethernet/xilinx/xilinx_axienet.h
index c771827587b3..6f0f13b4fb1a 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet.h
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h
@@ -122,7 +122,7 @@
 /* Default TX/RX Threshold and waitbound values for SGDMA mode */
 #define XAXIDMA_DFT_TX_THRESHOLD	24
 #define XAXIDMA_DFT_TX_WAITBOUND	254
-#define XAXIDMA_DFT_RX_THRESHOLD	24
+#define XAXIDMA_DFT_RX_THRESHOLD	1
 #define XAXIDMA_DFT_RX_WAITBOUND	254
 
 #define XAXIDMA_BD_CTRL_TXSOF_MASK	0x08000000 /* First tx packet */
-- 
2.31.1