From: Arthur Kiyanovski <akiyano@amazon.com>
Date: Thu, 19 Dec 2019 17:40:55 +0200
Subject: net: ena: fix default tx interrupt moderation interval
Patch-mainline: v5.5-rc3
Git-commit: 05785adf6e570a068adf0502b61fe2b521d7f0ca
References: git-fixes

Current default non-adaptive tx interrupt moderation interval is 196 us.
This value is too high and might cause the tx queue to fill up.

In this commit we set the default non-adaptive tx interrupt moderation
interval to 64 us in order to:
1. Reduce the probability of the queue filling-up (when compared to the
   current default value of 196 us).
2. Reduce unnecessary tx interrupt overhead (which happens if we set the
   default tx interval to 0).
   We determined experimentally that 64 us is an optimal value that
   reduces interrupt rate by more than 20% without affecting performance.

Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/amazon/ena/ena_com.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/amazon/ena/ena_com.h
+++ b/drivers/net/ethernet/amazon/ena/ena_com.h
@@ -92,7 +92,7 @@
 #define ENA_INTR_HIGHEST_PKTS           (128)
 #define ENA_INTR_HIGHEST_BYTES          (192 * 1024)
 
-#define ENA_INTR_INITIAL_TX_INTERVAL_USECS		196
+#define ENA_INTR_INITIAL_TX_INTERVAL_USECS		64
 #define ENA_INTR_INITIAL_RX_INTERVAL_USECS		0
 #define ENA_INTR_DELAY_OLD_VALUE_WEIGHT			6
 #define ENA_INTR_DELAY_NEW_VALUE_WEIGHT			4