APPLIED: [f/j/m/n:linux-aws][PATCH 0/1] aws: Backport latest ENA driver in upstream Linux to enable IRQ moderation

[Philip Cox]

On Thu, Mar 7, 2024 at 1:32 PM Philip Cox <philip.cox at canonical.com> wrote:

> BugLink: https://bugs.launchpad.net/bugs/2056475
>
> SRU Justification:
>
> [Impact]
> In Ubuntu AMIs for x86 and Graviton based EC2 instances, the standard
> Ubuntu AMI comes without IRQ moderation enabled for ENA, which for our
> latest generation instances with networking heavy workloads is up to a 25%
> performance regression (i.e. NGINX in a load-balancing configuration).
>
> [Fix]
> The mainline Linux kernel will now support IRQ moderation by default for
> ENA in the 6.9 kernel release via this patch:
> https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/drivers/net/ethernet/amazon/ena?id=50d7a2660579889fba28b7e4543d4ce85aa2311b
>
> [Test Plan]
> AWS tested
>
> [Where problems could occur]
> By enabling adaptive coalescing, the default interrupt behaviour will by
> changed to be more adaptive, which shows improvements on heavy network
> workloads, but my change the behaviour and performance on other network
> workloads differently. Rather than handling the interrupts based off of a
> fixed amount of time elapsed, it will change to an adaptive based approach.
> There should be no negative impact on light workloads, and a positive
> impact on heavy work loads. If there is an impact though, this option can
> be disabled via the ethtool command.
>
> [Other Info]
>
> SF: 00380449
>
> --
>
>
> David Arinzon (1):
>   net: ena: Enable DIM by default
>
>  drivers/net/ethernet/amazon/ena/ena_netdev.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> --
> 2.34.1
>
>
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