aws: enable PCI write-combine for arm64
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux-aws (Ubuntu) |
Fix Released
|
High
|
Kamal Mostafa | ||
Bionic |
Fix Released
|
High
|
Kamal Mostafa | ||
Focal |
Fix Released
|
High
|
Kamal Mostafa | ||
Groovy |
Fix Released
|
High
|
Kamal Mostafa |
Bug Description
To improve PCI performance on certain arm64 AWS instance types, enable arch_can_
From: Clint Sbisa <email address hidden>
Subject: [PATCH] arm64: Enable PCI write-combine resources under sysfs
https://<email address hidden>/
--------------
[Impact]
* AWS requires PCI-write-combine be enabled for arm64 via this one-line patch, to effect a significant performance improvement on certain AWS arm64 instance types.
* After considerable discussion, upstream indicates that this patch will be accepted into mainline[0] once additional documentation details get added to the commit description.
* Applying this patch to linux-aws affects only AWS arm64 instance types.
[Test Case]
* Has been performance-tested by AWS; smoke-tested by me.
[Regression Potential]
* Low.
[0] https://<email address hidden>/
CVE References
Changed in linux-aws (Ubuntu Bionic): | |
status: | New → In Progress |
Changed in linux-aws (Ubuntu Focal): | |
status: | New → In Progress |
Changed in linux-aws (Ubuntu Bionic): | |
assignee: | nobody → Kamal Mostafa (kamalmostafa) |
Changed in linux-aws (Ubuntu Focal): | |
assignee: | nobody → Kamal Mostafa (kamalmostafa) |
Changed in linux-aws (Ubuntu Bionic): | |
importance: | Undecided → Low |
Changed in linux-aws (Ubuntu Focal): | |
importance: | Undecided → Low |
Changed in linux-aws (Ubuntu Groovy): | |
importance: | Undecided → Low |
Changed in linux-aws (Ubuntu Bionic): | |
importance: | Low → Medium |
Changed in linux-aws (Ubuntu Focal): | |
importance: | Low → Medium |
Changed in linux-aws (Ubuntu Groovy): | |
importance: | Low → Medium |
Changed in linux-aws (Ubuntu Bionic): | |
status: | In Progress → Won't Fix |
Changed in linux-aws (Ubuntu Focal): | |
status: | In Progress → Won't Fix |
Changed in linux-aws (Ubuntu Groovy): | |
status: | In Progress → Won't Fix |
Changed in linux-aws (Ubuntu Bionic): | |
status: | Won't Fix → In Progress |
Changed in linux-aws (Ubuntu Focal): | |
status: | Won't Fix → In Progress |
Changed in linux-aws (Ubuntu Groovy): | |
status: | Won't Fix → In Progress |
Changed in linux-aws (Ubuntu Focal): | |
status: | In Progress → Fix Committed |
Changed in linux-aws (Ubuntu Bionic): | |
status: | In Progress → Fix Committed |
https:/ /lists. ubuntu. com/archives/ kernel- team/2020- September/ 113166. html
Smoke-tested on AWS arm64 instances.