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 B39874F391E; Mon, 28 Sep 2026 19:28:41 +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=1790623726; cv=none; b=hPOumOpSNVqoQlDS0EBWIS4umJaylnQmeD5cAmOYygGeP8en27qaZ8XIwIcYX351dha6zxZS9KKn5sNm413Jbsn4sm0FyW/4jNyv/waY1+hn1LUmX2T/kOzQV2TjbB7/A+Uj1DwmlfsBJOKOQgOfrhyHJ7l/BGyBDVZlOrGHON4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790623726; c=relaxed/simple; bh=ZPpOyI+RGVODWfCoIjR0Z+6xnmSW0dErgiTKfYd0Kyw=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=cbRUx8uQXGAO/4yEvdbKB94adr3fU+BAQ/5m44//fBT4fFPgl+WFBsUifXvpzNDWhxRwa1OV5Hrxq0fY7JOHvQpchlOIS3M1Q24Cb0DDUTwL6hfovDdvHqilAnYFEPMS2bAtrYS9E6FOQSG//x/SJuWVETZAdVcHAgl1pfm6W3E= 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=BOuXZ6Kx; 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="BOuXZ6Kx" 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=ZPpOyI+RGVODWfCoIjR0Z+6xnmSW0dErgiTKfYd0Kyw=; b=BOuXZ6Kx2JG4SF07WsRq+qLQpi Xah6rkq20d7k3agnCaoZ5DtgGfWtvqDS8o/vabi/BxOFIvx6SLQKwAu58CFl0xd3WMPRoZbBvJpyb lSkxAO/sf+/VIEkazcS+F/5/0OxuO+FklW9NMnyGm4V5BzV/TcvA1pZvZlGZc3JbHod1EB0Isy0H+ 6fu5nMwT/38rhJH3mXeGAwGyWC5yA6gjrC99kf2PsL+Y4SJarxDQqad3wQmHIuY6ZoSlhpyT7Gry5 2u2GueO+CBoBkvCUHcLQomgkno48jP0u//gC3hwcPJjelyla15N8/GJbT95uf3+O8erT1QhXtGWNh /4VlOTZg==; Received: from 54-240-197-235.amazon.com ([54.240.197.235] helo=edge-m3-r2-132.e-iad51.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1xBH1Z-00000008Spo-3pIg; Mon, 28 Sep 2026 19:28:32 +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: Mon, 28 Sep 2026 20:28:24 +0100 In-Reply-To: <7098f5d2-043d-464a-82d9-a105e4000c02@enneenne.com> References: <20260829210041.40649-1-dwmw2@infradead.org> <20260829210041.40649-3-dwmw2@infradead.org> <7098f5d2-043d-464a-82d9-a105e4000c02@enneenne.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-V8YPTHVYynRdDxEhQYE+" User-Agent: Evolution 3.62.0-0ubuntu1~ppa1~24.04 Precedence: bulk X-Mailing-List: netdev@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 --=-V8YPTHVYynRdDxEhQYE+ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2026-09-28 at 18:41 +0200, Rodolfo Giometti wrote: > On Mon, 2026-09-28 at 14:37 +0100, David Woodhouse wrote: > > But I can *simulate* it, by running a virtual machine with vmclock and > > knowing the precise relationship of counter to real time that I'm > > *telling* it to discipline against =E2=80=94 then checking how it did. = Your "no > > independent reference anywhere" is my "I'm actually testing the part I > > want to test" :) >=20 > What it cannot show is the thing this patch actually enables: hardpps > on a tickless kernel driven by a real PPS source, with its jitter, its > IRQ latency, and the CPU going idle between pulses. If you (or someone > on Cc) can run it for a while with a GPS PPS on a GPIO and report how > the offset converges compared with a tickful kernel, that is the test > I would like to see mentioned in the commit message. If not, please at > least state there that the validation was done with the simulated 4/4 > pulse only. Yeah, working on that now. My first soak test on the nohz_full build didn't have nohz_idle, so it wasn't really very tickless. Running it again now, it looks a bit better =E2=80=94 a test binary in an initramfs, no network or real system activity. Waking once a minute to dump stats to the serial port. With HZ=3D250 it's only waking about 1500 times a minute, and I'm seeing ntp_error p95 21ns, p100 116ns. More data, and pretty graphs, when I'm confident of the results and have the A/B testing. I'll get some data on the distribution of the sleep times too (I'm assuming most of those wakeups come while the serial dump is running). The ntp_error being corrected is still two orders of magnitude less than the jitter on the IRQ, mind you. I think it's even processing the timekeeping when woken by an the IRQ, before running the PPS IRQ handler. I'm going to play with that IRQF_HWTIMESTAMP thing I mentioned, and sample the counter right at the start of the exception vector. 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