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See http://www.infradead.org/rpr.html --=-7bb81Y+OUHlwFXdroW5Q Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable In Linux I've been fixing the handling of ntp_error =E2=80=94 the kernel's = own record of the difference between the time adjtimex() asked it to report, and the time it *actually* reports due to the integer precision of its tick arithmetic. On a tickless kernel that transient error can reach tens of microseconds before the kernel's dithering corrects it. In the series=C2=B9 I'm working on, that is reduced to nanoseconds. The final patch of the series changes the system timestamps reported by PPS_FETCH and the PTP PTP_SYS_OFFSET family of ioctls. They'll now report the time the kernel *wanted* to report at the moment of the paired timestamp, rather than the output of the tick-based timekeeping which sawtooths around that ideal. These are *paired* timestamps =E2=80=94 the system clock sampled against a pulse edge or a PHC reading =E2=80=94 so what matters is that the pair is accurate, not that the system half of it matches other reads of the system clock. The difference from clock_gettime(CLOCK_REALTIME) at the same instant is just a known error which the kernel was already committed to eliminating. With the rest of the series applied (removing the known cases where that ntp_error delta accumulates significant values), that difference measured at up to =C2=B110ns on a tickless kernel, so this part is belt and braces. But ntp_error can still accumulate over a long tickless idle period, and when it has, there's no reason to knowingly hand a consumer a timestamp which we *know* to be wrong. Miroslav has already acked this correction (which is patch 6 of the series) from the chrony point of view=C2=B2; it would be good to have an ac= k from the ntpd side too, if possible. For ntpd I can see two places that the now-corrected timestamps are consumed: PHC-to-system offsets =E2=80=94 whether measured by ntpd itself o= r by phc2sys feeding ntpd over SHM =E2=80=94 are now against the intended timeli= ne, and the PPSAPI timestamps into refclock_atom and the PPS-capable drivers. Is there anything in ntpd which assumes those timestamps and clock_gettime() are on exactly the same timeline, or any other reason the correction could cause a problem? =C2=B9 https://lore.kernel.org/all/20261106030856.2538039-1-dwmw2@infradead= .org/ =C2=B2 https://lore.kernel.org/all/atoVLqWfyJtCfci2@localhost/ --=-7bb81Y+OUHlwFXdroW5Q Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw 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