quoted

You are right in the regard that it is not a network specific functionality.
Having said that, PHC is a network card capability, making it a network-

related component rather than purely a timekeeping feature.

quoted

Moreover we failed to find an existing tool which would allow users to get

valuable feedback of the system's overall health.

quoted

Researching its existing support in the kernel we noted that:
- PHC is embedded in network NIC and is supported by multiple NIC
vendors in the kernel
- PHC information is visible through ethtool -T
- The Linux networking stack uses PHC for timekeeping as well as for packet

timestamping (via SO_TIMESTAMPING).

quoted

  Packet timestamping statistics are available through ethtool
get_ts_stats hook

We have found `ethtool -S` as a suitable location for exposing these

statistics, which are unique to the ENA NIC.

quoted

We'd appreciate your thoughts on the matter, is there an alternative tool

you can recommend?

We try to steer folks towards read-only debugfs files for stuff that's not
strictly networking related. You also add a custom sysfs file in patch 4, I
reckon adding stats there may also be a natural place for the user?

Patch 4 FWIW is lacking slightly in the justification, would be good to clarify
why it's disabled by default. Single sentence of "why" would be great.

Hi Jakub,

Thank you for the feedback and the recommendations, we will incorporate them in v7.