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 C2F32519DFE; Tue, 29 Sep 2026 12:02:15 +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=1790683340; cv=none; b=pjkMe87sOVXgotjxQPmo5xyyXAwo/6zAoObNe5EAfJKZFQm5LtFftgi+5svom6KH2ED1Dvq5DznQOqquuyacipTlCroVX84iFZs1N13lWjtTJPJoDJ9rC8hc8OT9/yKPUge6HeGPa9d7DoslsUUEwQc7/bFgfHK+nvEf8iThvS8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790683340; c=relaxed/simple; bh=ATgyXVaMgrFKsPvLVQ+RZnSuKCvwox9JJiCdXJgFeXk=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=emxKhhuFnnmSivVSSakGbgIOQmkhkj43SwMH7qJxjWxNtqswoH4QbjEiqGoKkv2/xu8TxzjaqT2A0+8eZNLYRpVRQGwiqomsu1JnDABjVJ69HPBwTz3x4beBeGEeAXkUiM79880RpSLlRnhqBmQ5ncKey52XuVCZ47omxtuKRMw= 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=hm/AN8uw; 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="hm/AN8uw" 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:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description; bh=ATgyXVaMgrFKsPvLVQ+RZnSuKCvwox9JJiCdXJgFeXk=; b=hm/AN8uwGs3N6Cf9oxXYMVvL/Q zrU5D589I8WiiYk2oxP3KONmzo6sCtSfS4SPD+8GoPEVyY3wdjsia61fwMsa/AC9QQFmlrj5+ImHn 6FcWzaa/rmFGiKxKmE1ZPlgyWt5knHH3pBQn0PAyP5iV+QZ74fF27aq4LDn3siiGKV0gF+gdL7GUH cXqg+Nh4hRmlwJfORshAX/sUBZ2LPlwo0HTt5cPcKNl567uZ0YTBih03hkZw9Ue/53cnJuRJHSZNI K7asrZYKjEls0nBNcq9/0w8IfLYD0CuBu9fZDu8qD4mh8iORZJPPtPtYksvhjBWtFdxJe5O/RBZnY H7/+GKCg==; Received: from 54-240-197-238.amazon.com ([54.240.197.238] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1xBWXB-0000000Ci5y-35e9; Tue, 29 Sep 2026 12:02:09 +0000 Message-ID: Subject: Re: [PATCH v4 2/4] pps: Drop the !NO_HZ_COMMON dependency from NTP_PPS From: David Woodhouse To: Rodolfo Giometti , Richard Cochran , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , John Stultz , Thomas Gleixner , Stephen Boyd , Miroslav Lichvar , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Alexander Gordeev Date: Tue, 29 Sep 2026 13:02:08 +0100 In-Reply-To: References: <20260829210041.40649-1-dwmw2@infradead.org> <20260829210041.40649-3-dwmw2@infradead.org> <7098f5d2-043d-464a-82d9-a105e4000c02@enneenne.com> <7f98cef0918465e8d6bc9e76d26afb8b12471773.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-1tU5tdC5rGDMHCnGTvTh" 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 --=-1tU5tdC5rGDMHCnGTvTh Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2026-09-29 at 13:48 +0200, Rodolfo Giometti wrote: > Hi David, >=20 > On 29/09/2026 11:32, David Woodhouse wrote: > > When second_overflow() is delivering skew, timekeeping_max_deferment() > > should trigger a wakeup at the end of the second to ensure that the > > skew gets recalculated =E2=80=94 rather than leaving it active indefini= tely. >=20 > Please put this fix in the series before 2/4, as for the tick_length > one. Yep. I've vacillated a bit about ntp_error: should we compensate for it (patch 1/4), should we *eliminate* it (as I mentioned we can again now I added the wakeup), and/or should we avoid the situations where it even *accumulates* in large quantities (e.g. time_offset being changed mid-second while skew is still running, so the now-unwanted skew has nowhere to go but ntp_error). I have come to the conclusion that all three can be true simultaneously, and I have patches for each :) > > So the results at https://david.woodhou.se/ntptest-r64/tickless/=C2=A0n= eed > > to be redone, but you can take a look and shout if you want me to > > change what I'm capturing or how I'm doing it. >=20 > What you capture is fine for me: the adjtimex state (offset, jitter, > stabil, errcnt) plus the per-pulse phase are what I wanted to see. >=20 > Two questions for the rerun: >=20 > - wouldn't it be better to also have the tickful baseline with the same > =C2=A0=C2=A0 board, the same GPS and the same pulse period, so the number= s can be > =C2=A0=C2=A0 compared directly? >=20 > - since typical PPS sources deliver 1 Hz, don't you think it would be > =C2=A0=C2=A0 better to also do one run with the timepulse at 1 Hz? That full 2x2 matrix is on the list, but I only have one board. :) --=-1tU5tdC5rGDMHCnGTvTh 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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