** Changed in: linux-aws (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1893817
Title:
aws: enable PCI write-combine for arm64
Status in linux-aws package in Ubuntu:
In Progress
Status in linux-aws source package in Bionic:
Fix Committed
Status in linux-aws source package in Focal:
Fix Committed
Status in linux-aws source package in Groovy:
In Progress
Bug description:
To improve PCI performance on certain arm64 AWS instance types, enable
arch_can_pci_mmap_wc() via the patch:
From: Clint Sbisa <csb...@amazon.com>
Subject: [PATCH] arm64: Enable PCI write-combine resources under sysfs
https://lore.kernel.org/linux-
pci/20200831151827.pumm2p54fyj7f...@amazon.com/
--------------
[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://lore.kernel.org/linux-
pci/20200917140116.ga4...@e121166-lin.cambridge.arm.com/
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