From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EAB7125F7B9 for ; Fri, 2 Oct 2026 22:47:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790981283; cv=none; b=TbAoCE7nw7775Z3JJ6KlWSAzTDqPJz+96vgzdOihoeFCf0SQj7we5WtfXKLqDZSGKtNLnbwuWS15TfhUKHHRZiWhkadFR4lUdBx0a/nHqyKl0qbuQJtrsM3OhM/ozMX+MzJibzJ+N62ZRkDBvidfaubwzgltPMfSiuVloCub1so= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790981283; c=relaxed/simple; bh=fXZ56qlEX/gj/bKBm90p0mGv+M4UJ+eY9PfdP/9xE3I=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=DpubfgKSF46pa1uQPkq6JEuJIWyvXvBpJFBfNUDQQeSFKp7ouuL/W2IYOXigbUXiFsKT+mTI9RaOmAjKZAb+odweDMIjMoLzVZnCOMI9z3j5xRm7GjYgLO7whdLi9gi9qAubOLqgoNUec5B336MnOGdMLnrhFjVYx0pjmOXMy3g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=pQUcQ8MT; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="pQUcQ8MT" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=fXZ56qlEX/gj/bKBm90p0mGv+M4UJ+eY9PfdP/9xE3I=; b=pQUcQ8MTYrJ5qti+EemFZj+VUa i5zjgT0CkkkVWSXMU+It8sxwx2ov2I3hpqyoPJQcI5CJ2FY18pt4TMbTGLhOwdIBBIwlI1JApLvtU aPTGGt1ZR9yc0dSOTQc+H0BfsAnvDhjkH0rvSrRymQJHPACWDlx3qzajJo5lIw693Ps0HBj4p/B9/ UGZCu6tsYNJqQAt9ubh6Q9zb8tePiilcv7XXcuXQjLvIcg9yE0Vx8WoUleR/zcfD1fZUr6EYIBYnx uar/X9MEKXor+igoUuHVVNluaoRoLS7cBUFHUVwHeZpK4f88Vj8hPlg81RlCyr8mI4uDxjXWfeeGo WeLnNgYg==; Received: from 54-240-197-239.amazon.com ([54.240.197.239] helo=edge-m2-r2-139.e-iad50.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCm2j-000000035Lg-0KF5; Fri, 02 Oct 2026 22:47:53 +0000 Message-ID: <46df3bedea175007a6480b4cb8ba070c6ff3d527.camel@infradead.org> Subject: Re: [PATCH 5/5] [DO NOT MERGE] timekeeping: Apply extrapolated ntp_error to clock snapshots From: David Woodhouse To: Rodolfo Giometti , Thomas Gleixner , John Stultz Cc: Stephen Boyd , Miroslav Lichvar , Ryan Luu , Julien Ridoux , linux-kernel@vger.kernel.org Date: Fri, 02 Oct 2026 23:47:50 +0100 In-Reply-To: <7274f4ef-edec-4282-9c92-b6f7918b8320@enneenne.com> References: <20261001202134.33929-1-dwmw2@infradead.org> <20261001202134.33929-6-dwmw2@infradead.org> <0d5d56ca-89fa-4f09-bd24-9c730dd27656@enneenne.com> <4751c410a0cb17270e6c2b43e70d01bfd7d6f0d0.camel@infradead.org> <7274f4ef-edec-4282-9c92-b6f7918b8320@enneenne.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-jZ/trK5rUN4/16NBDC8s" User-Agent: Evolution 3.62.0-0ubuntu1~ppa1~24.04 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-jZ/trK5rUN4/16NBDC8s Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2026-10-02 at 12:26 +0200, Rodolfo Giometti wrote: > =C2=A0 > > So I think we do need it, and my inclination is to hold off on enabling > > CONFIG_NTP_PPS for tickless kernels until we do. But I'll defer to your > > preference. If you want to merge it sooner on the basis that with a > > 1PPS signal the system doesn't get to sleep for long *anyway*, I can do > > another test run with just patches 1-4. > >=20 >=20 > Yes, please do that run. This patch changes what PPS_FETCH returns to > userspace, so it has to wait for the chrony and ntpd people anyway; if > 1-4 alone are good enough at 1PPS I'd rather not tie the tickless > enablement to it. https://david.woodhou.se/ntptest-r64/rodolfo-14-tickless-1hz/ Fairly much identical to the full series running tickless, which was https://david.woodhou.se/ntptest-r64/tickless-1hz/ And not really much worse than the tickful variant https://david.woodhou.se/ntptest-r64/tickful-1hz/ The ntp_error isn't measured because it's the clean series and most of the instrumentation is gone. I'll set the 5s pulse version running overnight. The series is also tested on four virtual machines on the same host, tickful and tickless, patches vs. baseline. You can see the tickless baseline wobble when the actual frequency changes, while the other three remain stable. You can also see ntp_error on both baseline kernels spiking during the initial sync. https://david.woodhou.se/ntptest-virt/ --=-jZ/trK5rUN4/16NBDC8s 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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