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Diffstat (limited to '')
| -rw-r--r-- | debian/patches/features/all/ena/net-ena-improve-latency-by-disabling-adaptive-interr.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/debian/patches/features/all/ena/net-ena-improve-latency-by-disabling-adaptive-interr.patch b/debian/patches/features/all/ena/net-ena-improve-latency-by-disabling-adaptive-interr.patch new file mode 100644 index 000000000..ec5dc707c --- /dev/null +++ b/debian/patches/features/all/ena/net-ena-improve-latency-by-disabling-adaptive-interr.patch @@ -0,0 +1,41 @@ +From: Sameeh Jubran <sameehj@amazon.com> +Date: Wed, 1 May 2019 16:47:08 +0300 +Subject: [PATCH] net: ena: improve latency by disabling adaptive interrupt + moderation by default +Origin: https://git.kernel.org/linus/78cb421d185cfb4fcea94e7c3ff6e6ea77bb8c11 +Bug-Debian: https://bugs.debian.org/941291 + +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: 1738cd3ed342 ("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> +--- + drivers/net/ethernet/amazon/ena/ena_com.c | 6 +++++- + 1 file changed, 5 insertions(+), 1 deletion(-) + +Index: linux/drivers/net/ethernet/amazon/ena/ena_com.c +=================================================================== +--- linux.orig/drivers/net/ethernet/amazon/ena/ena_com.c ++++ linux/drivers/net/ethernet/amazon/ena/ena_com.c +@@ -2801,7 +2801,11 @@ int ena_com_init_interrupt_moderation(st + /* 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: |