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 107FC21E097; Thu, 1 Oct 2026 15:39:05 +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=1790869149; cv=none; b=XFqdLQgsE6PbGHL4v47hLUDWLGvILq7Xh5Fg80HaBhH+Bp3oplUFN/oFMM87Tuhtn+ApU5hpKfqbb63nYSz57nL5FlwAW7+WZnV3frPW4OzdNWsZxecg6zP3QG5GsJgvOw8v0g12SNWMAy7HDeG3OszM2prJfyl25n1liGXezTw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790869149; c=relaxed/simple; bh=Q4T8U4l35+JZfRpQTP67KypiJT5nk3SiZajXKCmMPI0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=sWSi/kVSFqbCtO2daGE5OBM1PfK1IpYPTTIR2sj7fb6USLka+rK//kBpMMq6pVE5afHilMidVT9eYTMC3MUQ6Hc4Xs9T3RRJCQFtQ03xWX8PxzfiSyYA5ZyMNg5ht3s0mC8YW7hiUW8J6GNFGJr/Kr0fyjhEQ5SNtHBUVYnkr5I= 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=raOets9C; 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="raOets9C" 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=2u37AIR+/A2/tGHWBlQRSR59xKBep++dw5myZn2LtUg=; b=raOets9Cov+DVSbGMva0LRUBd5 nvp0XNgebUENef4iZtgdPPtJdb/Qsbmrul/U9Z2U0stE0sZp1N75GWN/5EsxEHsuoXojgs38q9DuB hF1HkZMQaYk+ccH1bRYJcQHHgFXKGqrejD+oI6eVnmWA19kRM++/e63dpCohuFmZWGNwxlrWxjpJc HDlk0Spdrei5awlhdumuow7bfjGX6jnhU6ANrz3ixDJ5qL25xBTKELV9vjKPTEc2DIwwS43qcyH4d RGJOccFuH8piycAG5hjiVfIdEJduS6CbJygJU3o2yR2I4QoaZlMcjkYahYFWcaTxyoj9syh3jv1u3 3NstDhTA==; Received: from 54-240-197-230.amazon.com ([54.240.197.230] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCIs7-00000008Mkt-36l3; Thu, 01 Oct 2026 15:38:59 +0000 Message-ID: Subject: Re: [PATCH v4 3/4] pps: Always use ktime_get_snapshot_id() for pps_get_ts() From: David Woodhouse To: Miroslav Lichvar , Rodolfo Giometti Cc: Richard Cochran , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , John Stultz , Thomas Gleixner , Stephen Boyd , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Alexander Gordeev Date: Thu, 01 Oct 2026 16:38:58 +0100 In-Reply-To: References: <20260829210041.40649-1-dwmw2@infradead.org> <20260829210041.40649-4-dwmw2@infradead.org> <920a2d70-c1ec-452b-8fc4-aebf1f6af412@enneenne.com> <4afec82e-9e3d-4615-9657-7d467d8dc3e7@enneenne.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-yAy89XO5Ur2WNK08h/qF" 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 --=-yAy89XO5Ur2WNK08h/qF Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-10-01 at 15:14 +0200, Miroslav Lichvar wrote: > On Mon, Sep 28, 2026 at 09:58:02AM +0200, Rodolfo Giometti wrote: > > On Sat, 2026-09-26 at 21:38 +0100, David Woodhouse wrote: > > > So yes, the specific code path you're looking at *does* get slightly > > > longer (50ns to the counter read instead of 30ns). > > [...] > > > However, they are *entirely* in the noise, as there's about 600 ns of > > > hardware and 2-4 *microseconds* of software latency before we even ge= t > > > there. > >=20 > > Thanks for measuring it, and on real hardware with a real edge. That > > answers my concern: ~20 ns of constant cost against microseconds of > > latency upstream of the handler is not something PPS can see, and > > trading it for the removal of a non-constant error is the right > > trade. >=20 > FWIW, there are some polling versions of the pps-gpio driver (out of > tree), which provide much more stable measurements by trading > interrupts for higher CPU use and where this additional delay might be > visible. Hm, interesting. Got a reference? What does it do, set a timer for when it thinks the end of the second is imminent, and spinwait then? I imagine it's something along the lines of: count2 =3D arch_inlined_clocksource_read(); do { count1 =3D count2; pulse =3D gpio_read(); count2 =3D arch_inlined_clocksource_read(); } while (!pulse && !too_late()); /* And *now* we can take as long as we like to convert * avg(count1,count2) into an actual time */ If it *doesn't* have the inlined read as the fast path like that, then it isn't even *trying*, and one might argue that it doesn't get to have an opinion on the 20ns I just stole from it. (I *did* give most of that 20ns back, although the arm64 maintainers aren't keen on inlining the clocksource; if we do really want it, we'd have to make a real-world case that isn't a microbenchmark.) --=-yAy89XO5Ur2WNK08h/qF 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 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