Commit 78cb421d authored May 01, 2019 by Sameeh Jubran Committed by David S. Miller May 04, 2019

net: ena: improve latency by disabling adaptive interrupt moderation by default



Adaptive interrupt moderation was erroneously enabled by default
in the driver.

In case the device supports adaptive interrupt moderation it will
be automatically used, which may potentially increase latency.

The adaptive moderation can be enabled from ethtool command in
case the feature is supported by the device.

Fixes: 1738cd3e ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Guy Tzalik <gtzalik@amazon.com>
Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 9a27de0c

drivers/net/ethernet/amazon/ena/ena_com.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -2802,7 +2802,11 @@ int ena_com_init_interrupt_moderation(struct ena_com_dev *ena_dev)
		/* if moderation is supported by device we set adaptive moderation */
		delay_resolution = get_resp.u.intr_moderation.intr_delay_resolution;
		ena_com_update_intr_delay_resolution(ena_dev, delay_resolution);
		ena_com_enable_adaptive_moderation(ena_dev);

		/* Disable adaptive moderation by default - can be enabled from
		* ethtool
		*/
		ena_com_disable_adaptive_moderation(ena_dev);

		return 0;
		err:

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