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See http://www.infradead.org/rpr.html --=-6OHAFwX89h9NLkUhL9dK Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-10-01 at 21:21 +0100, David Woodhouse wrote: > The timekeeper's ntp_error variable tracks the delta between the ideal > time that the kernel *should* be reporting as CLOCK_REALTIME, and the > time that is *actually* being reported. >=20 > A previous patch series in v7.3, up to commit 794ddd6e15cf ("ntp: > Remove tick_length_base, use tick_length directly"), fixed *errors* in > the accounting of ntp_error =E2=80=94 cases where the reported time would > diverge from the ideal time *without* the divergence being correctly > tracked in ntp_error for subsequent compensation. >=20 > This series is the next step: it reduces the magnitude of the > excursions which are (now) *correctly* tracked in ntp_error. >=20 > The ntp_error mechanism works fine when it remains close to zero. The > actual clock is steered back towards the ideal by a single =C2=B11 > dithering of the per-cycle 'mult' period, changing between high and > low each time ntp_error crosses zero. >=20 > This doesn't work as well when the value of ntp_error gets higher. In > some cases, 83=C2=B5s of ntp_error was seen. Draining that through the mu= lt > =C2=B11 dithering, at typically less than 1ns/s, could take days. And whi= le > it does, the precision of the frequency that can be effected by the > kernel's timekeeping is limited by the integer quantisation, because > it's permanently biased to either mult or mult+1 according to the > direction of the persistent ntp_error, and frequencies between the two > values cannot be achieved by the normal dithering. On top of which, > chrony was attempting to discipline the *reported* clock, even as > the kernel was attempting to steer it as hard as it could (albeit > not very hard) back to the kernel's ideal. >=20 > There are two cases where during frequency/phase adjustment, the > change was effectively applied to the 'ideal' vs 'actual' rate at > different moments in time. This accounting for this in ntp_error was > self-consistent, but the better answer is for them to be conceptually > applied at the same moment, without contributing anything to ntp_error > at all. >=20 > While the timekeeping code is applying a phase correction, that > applies an additional bias to the per-cycle 'mult' values. If a > tickless kernel goes idle while this skew is being applied, it can > continue to apply that bias *long* after it was intended to finish, > overshooting the intended phase correction (by 500=C2=B5s/s in the case o= f > adjtime). Fix this in timekeeping_max_deferment() by requesting a > wakeup at the top of the next second while phase skew is being > applied. (NB: Only for the core timekeeper, not aux clocks which > remain as they were). >=20 > Finally, if ntp_error ever does get excessive, we can deliberately > apply a phase skew to return it to zero faster than the normal > dithering would permit. An equivalent mechanism was removed in commit > dc491596f639 ("timekeeping: Rework frequency adjustments to work > better w/ nohz") but especially with the timekeeping_max_deferment() > change mentioned above, this now works effectively even with (and > in fact especially with) tickless idle. But again only for the core > timekeeper... unless we want to wake for aux clocks too? >=20 > Tests running at https://david.woodhou.se/ntptest-virt/=C2=A0on baseline > vs. patched kernels, both tickless and periodic. The effect is seen > most clearly on the tickless kernel, where the baseline experiences > much higher jitter around corrections that should be smooth. Ping? Patches 1-4 of this should be ready to merge now. So is number 5 as far as I'm concerned, but I'm happy to entertain further discussion if anyone has an opinion they want to share. --=-6OHAFwX89h9NLkUhL9dK Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw DQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAOfSIeC0vv1xPQ+dgSxbIIrkaru6skAWJYaGFzmv q4Kq+2wU2jxhcWlJg/JeP5jEkq/LM3pn5aaLao79j+XRmS7J1ZpJKUODJVoM4s9MQJhTMvo4qS5Z S64g6QR7Obkz3I1Lr3aWeSBmDDEyzue+NKtuWZ1Cxy3RdXo/w5HgRc3l2AercOM3Gt1XonTzEtTb 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