** Changed in: linux-aws (Ubuntu Focal)
Status: In Progress => Fix Committed
** Changed in: linux-aws (Ubuntu Jammy)
Status: In Progress => Fix Committed
** Changed in: linux-aws (Ubuntu Mantic)
Status: In Progress => Fix Committed
** Changed in: linux-aws (Ubuntu Noble)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2056475
Title:
aws: Backport latest ENA driver in upstream Linux to enable IRQ
moderation
Status in linux-aws package in Ubuntu:
Fix Committed
Status in linux-aws source package in Focal:
Fix Committed
Status in linux-aws source package in Jammy:
Fix Committed
Status in linux-aws source package in Mantic:
Fix Committed
Status in linux-aws source package in Noble:
Fix Committed
Bug description:
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
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