I am looking in to this.
** Changed in: linux-aws (Ubuntu)
Assignee: (unassigned) => Philip Cox (philcox)
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https://bugs.launchpad.net/bugs/2054688
Title:
Update ena to 2.10.x or later
Status in linux-aws package in Ubuntu:
New
Bug description:
Please update the ena driver in the default AWS images to 2.10.x or
later. This is to enable use of the PTP hardware clock (PHC) for high
resolution timekeeping. https://github.com/amzn/amzn-
drivers/tree/master/kernel/linux/ena#ptp-hardware-clock-phc
Ideally it would be accompanied with a configuration which sets
`option phc_enable 1` in `/etc/modprobe.d/`, reads the error bound
from `/sys/devices/pci0000:00/0000:00:05.0/phc_error_bound` and adds
an appropriate chrony config snippet to `/etc/chrony/conf.d/` to use
this as a source per
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-time.html#ptp-
hardware-clock-requirements, but just making the driver available for
users to configure would be a good step.
This is only relevant on r7g instances in ap-northeast-1 (Tokyo) at
the moment, but is apparently rolling out to other instances and
regions. https://aws.amazon.com/about-aws/whats-new/2023/11/amazon-
time-sync-service-microsecond-accurate-time/
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