42 lines
1.6 KiB
Diff
42 lines
1.6 KiB
Diff
From: Sameeh Jubran <sameehj@amazon.com>
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Date: Wed, 1 May 2019 16:47:08 +0300
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Subject: [PATCH] net: ena: improve latency by disabling adaptive interrupt
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moderation by default
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Origin: https://git.kernel.org/linus/78cb421d185cfb4fcea94e7c3ff6e6ea77bb8c11
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Bug-Debian: https://bugs.debian.org/941291
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Adaptive interrupt moderation was erroneously enabled by default
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in the driver.
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In case the device supports adaptive interrupt moderation it will
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be automatically used, which may potentially increase latency.
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The adaptive moderation can be enabled from ethtool command in
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case the feature is supported by the device.
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Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
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Signed-off-by: Guy Tzalik <gtzalik@amazon.com>
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Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/ethernet/amazon/ena/ena_com.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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Index: linux/drivers/net/ethernet/amazon/ena/ena_com.c
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===================================================================
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--- linux.orig/drivers/net/ethernet/amazon/ena/ena_com.c
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+++ linux/drivers/net/ethernet/amazon/ena/ena_com.c
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@@ -2801,7 +2801,11 @@ int ena_com_init_interrupt_moderation(st
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/* if moderation is supported by device we set adaptive moderation */
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delay_resolution = get_resp.u.intr_moderation.intr_delay_resolution;
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ena_com_update_intr_delay_resolution(ena_dev, delay_resolution);
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- ena_com_enable_adaptive_moderation(ena_dev);
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+
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+ /* Disable adaptive moderation by default - can be enabled from
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+ * ethtool
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+ */
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+ ena_com_disable_adaptive_moderation(ena_dev);
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return 0;
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err:
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