** Changed in: linux-aws (Ubuntu Noble)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2067516
Title:
[aws] Backport CMA pool per numa functionality for 22.04 and 20.04
Status in linux-aws package in Ubuntu:
Fix Released
Status in linux-aws source package in Noble:
Fix Committed
Bug description:
SRU Justification:
[Impact]
We discovered a network packets per second (PPS) performance issue in
one of our upcoming EC2 instance platform on Graviton.The issue is
addressed by setting a value for the numa_cma parameter. While this
parameter is supported in 24.04, the parameter is not available in
22.04 or 20.04 today, which could impact customers running 22.04 or
20.04 on the new EC2 platform.
[Fix]
We are requesting the the following changes be backported to 22.04 and 20.04
for ARM:
https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-aws/+git/noble/commit/kernel/dma/contiguous.c?id=22e4a348f87c59df2c02f1efb7ba9a56b622c7b8
https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-aws/+git/noble/commit/kernel/dma/contiguous.c?id=bf29bfaa54901a4bdee2a18cd10eb951a884a5f9
EC2 Nitro team is only asking for the change in ARM, however we will
leave to Canonical's discretion to make the same changes in x86.
Also requested to add this fix for NUMA node overrides for AWS EC2 ENA
adapaters:
https://github.com/torvalds/linux/commit/2dc8b1e7177d4f49f492ce648440caf2de0c366
We also request Canonical set kernel params to "numa_cma=1:32M" for
all OSes that support this parameter - 24.04, 22.04 and 20.04.
Focal only needs this via the 5.15 based backport kernel, and not the 5.4
based focal kernel.
[Test Plan]
aws tested
[Where problems could occur]
[Other info]
sf# 00385923
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