On 2/11/2025 1:46 AM, Jakub Kicinski wrote:

On Sun, 9 Feb 2025 12:33:24 +0000 Vadim Fedorenko wrote:

quoted

Yes, we have seen this patchset, and we were thinking of how to
generalize error_bound property, which was removed from the latest
version unfortunately. But it's a good point to look at it once
again in terms of our prototype, thanks!

I was wondering whether they have a user space "time extrapolation
component" which we should try to be compatible with. Perhaps they
just expect that the user will sync system time.

error_bound has a different purpose - it tries to get the "baseline"
clock accuracy from the HW. The number returned here is needed to
calculate the uncertainty, not to extrapolate.

And yes - AFIK AWS suggests system time sync for EC2 instances [1]

[1]
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configure-ec2-ntp.html